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                <h1><span class="hidden">The LinuxSampler Project</span></h1>

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                        <div id="contents">

                        <h2>FAQ</h2>
                        <p class="default">
                                Here is a collection of frequently asked questions. Please read them before asking on
                                the mailing list.
                        </p>
                        <h3>Can I use LinuxSampler in commercial hardware or software products? </h3>
                        <p class="default">
                        You are NOT ALLOWED to use LinuxSampler source code, libraries or applications in
                        COMMERCIAL hardware or software products without prior written authorization by the
                        <a href="developers.html">authors</a>. <A HREF="downloads.html">See here</A>

                        <h3>linuxsampler? qsampler? libgig? liblscp? hu?</h3>
                        <p class="default">
                                There are currently four subprojects in the LinuxSampler project; linuxsampler,
                                qsampler, libgig and liblscp. linuxsampler is the core of the sampler, it includes the
                                sampler engines and audio and MIDI drivers. linuxsampler itself is decoupled from any
                                user interface. It offers a network server (LSCP server) to allow to be controlled by
                                an arbitrary user frontend from an arbitrary place over a network connection or
                                locally from the same machine as well.
                                qsampler is the first GUI frontend written for linuxsampler, it is written with the Qt
                                GUI library and thus can be compiled for various architectures and operating systems
                                without modifications on the source code.
                                libgig is a C++ library written for loading Gigasampler files and DLS Level 1 and 2
                                files. libgig is used by linuxsampler to load Gigasampler files and it <b>can</b> be
                                used by qsampler to retrieve additional informations about Gigasampler files. liblscp
                                is a C library written as a wrapper around the LSCP network protocol, thus to control
                                linuxsampler. It was originally designed to be used on both sides, that is on server /
                                backend side (linuxsampler) and on client / frontend side (e.g. qsampler). But it's now
                                only used on client side by qsampler at the moment.
                        </p>

                        <h3>What do I need to compile and install?</h3>
                        <p class="default">
                                You should compile and install at least libgig and linuxsampler. As a beginner you should
                                definitely as well compile and install liblscp and qsampler. qsampler is a
                                convenient GUI frontend for linuxsampler. qsampler depends on liblscp, so you have to
                                compile and install liblscp before starting to build qsampler. The recommended order to
                                compile and install is:
                                <ol class="default">
                                  <li>libgig</li>
                                  <li>linuxsampler</li>
                                  <li>liblscp</li>
                                  <li>qsampler</li>
                                </ol>
                        </p>

                        <h3>Compilation of LinuxSampler aborts with ... </h3>
                        <p class="default">
                                "<code>can't find a register in class `GENERAL_REGS' while reloading `asm'</code>"<br>
                                This is caused by the inline assembly code for SIMD optimization. You currently have to compile LinuxSampler with -O2 or -O3 to avoid this problem. Usually this done by default, if not try:
                        </p>
                        <table class="default" border="0" cellpadding="1" cellspacing="5">
                                <tr>
                                  <td><pre class="code">1
2</pre>
                                  </td>
                                  <td width="100%">
                                    <pre class="code">CXXFLAGS="-O3" ./configure
make</pre>
                                  </td>
                                </tr>
                        </table>
                        <p class="default">
                                Alternatively you could also disable all hand-crafted assembly optimization code by:
                        </p>
                        <table class="default" border="0" cellpadding="1" cellspacing="5">
                                <tr>
                                  <td><pre class="code">1
2</pre>
                                  </td>
                                  <td width="100%">
                                    <pre class="code">./configure --disable-asm
make</pre>
                                  </td>
                                </tr>
                        </table>
                        <p class="default">
                                but the latter is definitely not recommended, as it will increase CPU usage a lot!
                        </p>
                        <p class="default">
                                "<code>../common/Resampler.h:142: error: memory input 2 is not directly addressable</code>"<br>
                                This was reported (<a href="http://sourceforge.net/mailarchive/forum.php?thread_id=9018347&forum_id=12792">1</a>,
                                <a href="http://sourceforge.net/mailarchive/forum.php?thread_id=9019467&forum_id=12792">2</a>)
                                to be a gcc/g++ version problem. Make sure you got gcc and g++,
                                both of version 3.3 or higher installed. You can check this with:
                        </p>
                        <table class="default" border="0" cellpadding="1" cellspacing="5">
                                <tr>
                                  <td><pre class="code">1
2</pre>
                                  </td>
                                  <td width="100%">
                                    <pre class="code">gcc --version
g++ --version</pre>
                                  </td>
                                </tr>
                        </table>
                        <p class="default">
                                In case you already got gcc and g++ of version 3.3 or higher
                                installed and it still causes the compilation error mentioned
                                above, try the following:
                        </p>
                        <table class="default" border="0" cellpadding="1" cellspacing="5">
                                <tr>
                                  <td><pre class="code">1
2</pre>
                                  </td>
                                  <td width="100%">
                                    <pre class="code">export CC=`which gcc`
export CXX=`which g++`</pre>
                                  </td>
                                </tr>
                        </table>

                        <h3>How do I checkout from CVS?</h3>
                        <p class="default">
                                The procedure of checking out the newest version from CVS is described on the
                                <a href="downloads.html">Downloads</a> site.
                        </p>

                        <h3>How do I compile from CVS?</h3>
                        <p class="default">
                                The procedure for compiling from CVS is the same for all subprojects, that is no matter
                                if you are compiling linuxsampler, qsampler, libgig or liblscp from CVS, you need to
                                have the autotools (automake, autoconf and libtool) installed and compile it that way:
                        </p>
                        <table class="default" border="0" cellpadding="1" cellspacing="5">
                                <tr>
                                  <td><pre class="code">1
2
3</pre>
                                  </td>
                                  <td width="100%">
                                    <pre class="code">make -f Makefile.cvs
./configure
make</pre>
                                  </td>
                                </tr>
                        </table>

                        <h3>Can I use linuxsampler without a GUI as well?</h3>
                        <p class="default">
                                Yes, but unfortunately there is no console based frontend frontend for linuxsampler (yet).
                                You have to write LSCP scripts and send it to the running linuxsampler application.
                                You can send a LSCP script to linuxsampler on the console with the following command:
                        </p>
                        <table class="default" border="0" cellpadding="1" cellspacing="5">
                                <tr>
                                  <td><pre class="code">1</pre>
                                  </td>
                                  <td width="100%">
                                    <pre class="code">cat yourscript.lscp | netcat -t localhost 8888</pre>
                                  </td>
                                </tr>
                        </table>
                        <p class="default">
                                Of course you can also replace localhost by the IP address of the machine where
                                linuxsampler is running. Alternatively you can also make a telnet connection (port 8888)
                                to linuxsampler's LSCP server and type commands manually.
                        </p>


                        <h3>Are there example LSCP script files somewhere?</h3>
                        <p class="default">
                                Yes, have a look on the <a href="documentation.html">Documentation</a> site for some
                                common LSCP script examples. For details about LSCP read the
                                <a href="api/draft-linuxsampler-protocol.html">LSCP reference</a>. Be welcome to ask
                                questions for details about LSCP on the mailing list.
                        </p>

                        <a name="dropouts"></a>
                        <h3>I get dropouts (click sounds, noise), what can I do about it?</h3>
                        <p class="default">
                                In order to achieve good results under Linux you need to have a
                                <a href="http://www.linuxdj.com/audio/lad/resourceslatency.php3">patched kernel</a>.
                                There are different patches available depending on what version (2.4.x or 2.6.x) of kernel you use.
                                The <a href="http://jackit.sourceforge.net/docs/faq.php">JACK FAQ site</a> is also a good resource
                                how to configure a realtime stable kernel. But note; LinuxSampler currently has not support for
                                libcap yet, that means if you are still using a 2.4.x Linux kernel you most probably have to run
                                LinuxSampler with root priviliges (support for libcap is planned though). As a rule of thumb: if
                                you don't get warnings like "cannot mlockall() memory" you are safe to run it as ordinary user as well.
                        </p>

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123
124			<h2>FAQ</h2>
125			<p class="default">
126			Here is a collection of frequently asked questions. Please read them before asking on
127			the mailing list.
128			</p>
129	schoenebeck	703	<h3>Can I use LinuxSampler in commercial hardware or software products? </h3>
130	senoner	702	<p class="default">
131	schoenebeck	703	You are NOT ALLOWED to use LinuxSampler source code, libraries or applications in
132			COMMERCIAL hardware or software products without prior written authorization by the
133			<a href="developers.html">authors</a>. <A HREF="downloads.html">See here</A>
134	senoner	542
135			<h3>linuxsampler? qsampler? libgig? liblscp? hu?</h3>
136			<p class="default">
137			There are currently four subprojects in the LinuxSampler project; linuxsampler,
138			qsampler, libgig and liblscp. linuxsampler is the core of the sampler, it includes the
139			sampler engines and audio and MIDI drivers. linuxsampler itself is decoupled from any
140			user interface. It offers a network server (LSCP server) to allow to be controlled by
141	schoenebeck	585	an arbitrary user frontend from an arbitrary place over a network connection or
142	senoner	542	locally from the same machine as well.
143			qsampler is the first GUI frontend written for linuxsampler, it is written with the Qt
144			GUI library and thus can be compiled for various architectures and operating systems
145			without modifications on the source code.
146			libgig is a C++ library written for loading Gigasampler files and DLS Level 1 and 2
147			files. libgig is used by linuxsampler to load Gigasampler files and it <b>can</b> be
148			used by qsampler to retrieve additional informations about Gigasampler files. liblscp
149			is a C library written as a wrapper around the LSCP network protocol, thus to control
150			linuxsampler. It was originally designed to be used on both sides, that is on server /
151			backend side (linuxsampler) and on client / frontend side (e.g. qsampler). But it's now
152			only used on client side by qsampler at the moment.
153			</p>
154
155			<h3>What do I need to compile and install?</h3>
156			<p class="default">
157	schoenebeck	585	You should compile and install at least libgig and linuxsampler. As a beginner you should
158			definitely as well compile and install liblscp and qsampler. qsampler is a
159	senoner	542	convenient GUI frontend for linuxsampler. qsampler depends on liblscp, so you have to
160	schoenebeck	585	compile and install liblscp before starting to build qsampler. The recommended order to
161			compile and install is:
162			<ol class="default">
163			<li>libgig</li>
164			<li>linuxsampler</li>
165			<li>liblscp</li>
166			<li>qsampler</li>
167			</ol>
168	senoner	542	</p>
169
170	schoenebeck	616	<h3>Compilation of LinuxSampler aborts with ... </h3>
171			<p class="default">
172			"<code>can't find a register in class `GENERAL_REGS' while reloading `asm'</code>"<br>
173	schoenebeck	618	This is caused by the inline assembly code for SIMD optimization. You currently have to compile LinuxSampler with -O2 or -O3 to avoid this problem. Usually this done by default, if not try:
174	schoenebeck	616	</p>
175	schoenebeck	618	<table class="default" border="0" cellpadding="1" cellspacing="5">
176			<tr>
177			<td><pre class="code">1
178			2</pre>
179			</td>
180			<td width="100%">
181			<pre class="code">CXXFLAGS="-O3" ./configure
182			make</pre>
183			</td>
184			</tr>
185			</table>
186			<p class="default">
187			Alternatively you could also disable all hand-crafted assembly optimization code by:
188			</p>
189			<table class="default" border="0" cellpadding="1" cellspacing="5">
190			<tr>
191			<td><pre class="code">1
192			2</pre>
193			</td>
194			<td width="100%">
195			<pre class="code">./configure --disable-asm
196			make</pre>
197			</td>
198			</tr>
199			</table>
200			<p class="default">
201	schoenebeck	807	but the latter is definitely not recommended, as it will increase CPU usage a lot!
202	schoenebeck	618	</p>
203	schoenebeck	807	<p class="default">
204			"<code>../common/Resampler.h:142: error: memory input 2 is not directly addressable</code>"<br>
205			This was reported (<a href="http://sourceforge.net/mailarchive/forum.php?thread_id=9018347&forum_id=12792">1</a>,
206			<a href="http://sourceforge.net/mailarchive/forum.php?thread_id=9019467&forum_id=12792">2</a>)
207			to be a gcc/g++ version problem. Make sure you got gcc and g++,
208			both of version 3.3 or higher installed. You can check this with:
209			</p>
210			<table class="default" border="0" cellpadding="1" cellspacing="5">
211			<tr>
212			<td><pre class="code">1
213			2</pre>
214			</td>
215			<td width="100%">
216			<pre class="code">gcc --version
217			g++ --version</pre>
218			</td>
219			</tr>
220			</table>
221			<p class="default">
222			In case you already got gcc and g++ of version 3.3 or higher
223			installed and it still causes the compilation error mentioned
224			above, try the following:
225			</p>
226			<table class="default" border="0" cellpadding="1" cellspacing="5">
227			<tr>
228			<td><pre class="code">1
229			2</pre>
230			</td>
231			<td width="100%">
232			<pre class="code">export CC=`which gcc`
233			export CXX=`which g++`</pre>
234			</td>
235			</tr>
236			</table>
237	schoenebeck	616
238	senoner	542	<h3>How do I checkout from CVS?</h3>
239			<p class="default">
240			The procedure of checking out the newest version from CVS is described on the
241			<a href="downloads.html">Downloads</a> site.
242			</p>
243
244			<h3>How do I compile from CVS?</h3>
245			<p class="default">
246			The procedure for compiling from CVS is the same for all subprojects, that is no matter
247	schoenebeck	585	if you are compiling linuxsampler, qsampler, libgig or liblscp from CVS, you need to
248	senoner	542	have the autotools (automake, autoconf and libtool) installed and compile it that way:
249			</p>
250			<table class="default" border="0" cellpadding="1" cellspacing="5">
251			<tr>
252			<td><pre class="code">1
253			2
254			3</pre>
255			</td>
256			<td width="100%">
257			<pre class="code">make -f Makefile.cvs
258			./configure
259			make</pre>
260			</td>
261			</tr>
262			</table>
263
264			<h3>Can I use linuxsampler without a GUI as well?</h3>
265			<p class="default">
266			Yes, but unfortunately there is no console based frontend frontend for linuxsampler (yet).
267			You have to write LSCP scripts and send it to the running linuxsampler application.
268			You can send a LSCP script to linuxsampler on the console with the following command:
269			</p>
270			<table class="default" border="0" cellpadding="1" cellspacing="5">
271			<tr>
272			<td><pre class="code">1</pre>
273			</td>
274			<td width="100%">
275			<pre class="code">cat yourscript.lscp \| netcat -t localhost 8888</pre>
276			</td>
277			</tr>
278			</table>
279			<p class="default">
280			Of course you can also replace localhost by the IP address of the machine where
281			linuxsampler is running. Alternatively you can also make a telnet connection (port 8888)
282			to linuxsampler's LSCP server and type commands manually.
283			</p>
284
285
286			<h3>Are there example LSCP script files somewhere?</h3>
287			<p class="default">
288			Yes, have a look on the <a href="documentation.html">Documentation</a> site for some
289			common LSCP script examples. For details about LSCP read the
290			<a href="api/draft-linuxsampler-protocol.html">LSCP reference</a>. Be welcome to ask
291			questions for details about LSCP on the mailing list.
292			</p>
293
294			<a name="dropouts"></a>
295			<h3>I get dropouts (click sounds, noise), what can I do about it?</h3>
296			<p class="default">
297			In order to achieve good results under Linux you need to have a
298			<a href="http://www.linuxdj.com/audio/lad/resourceslatency.php3">patched kernel</a>.
299			There are different patches available depending on what version (2.4.x or 2.6.x) of kernel you use.
300			The <a href="http://jackit.sourceforge.net/docs/faq.php">JACK FAQ site</a> is also a good resource
301			how to configure a realtime stable kernel. But note; LinuxSampler currently has not support for
302			libcap yet, that means if you are still using a 2.4.x Linux kernel you most probably have to run
303			LinuxSampler with root priviliges (support for libcap is planned though). As a rule of thumb: if
304			you don't get warnings like "cannot mlockall() memory" you are safe to run it as ordinary user as well.
305			</p>
306
307			</div>
308			</td></tr></table>
309
310			</div>
311
312			</body>
313			</html>