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112 <div id="mainwindow"><div class="lsbackground"><img name="LinuxSampler" src="gfx/lsbackground.jpg" alt="LinuxSampler"></div>
113
114 <h1><span class="hidden">The LinuxSampler Project</span></h1>
115
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175 <div id="contents">
176
177 <h2>FAQ</h2>
178 <div class="groupbox">
179 Here is a collection of frequently asked questions. Please read them before asking on
180 the mailing list.<br>
181 <br>
182 1.&nbsp;License<br>
183 &nbsp;&nbsp;&nbsp;&nbsp;1.1&nbsp;<a href="#commercial_products">Can I use LinuxSampler in commercial hardware or software products?</a><br>
184 &nbsp;&nbsp;&nbsp;&nbsp;1.2&nbsp;<a href="#commercial_music">Can I use LinuxSampler for commercial music production?</a><br>
185 &nbsp;&nbsp;&nbsp;&nbsp;1.3&nbsp;<a href="#open_source">LinuxSampler is not open source, you are evil!</a><br>
186 &nbsp;&nbsp;&nbsp;&nbsp;1.4&nbsp;<a href="#closed_source">Will LinuxSampler turn closed-source?</a><br>
187 &nbsp;&nbsp;&nbsp;&nbsp;1.5&nbsp;<a href="#ls_license_change">I've heard the commercial exception of LinuxSampler was added at a certain version?</a><br>
188 &nbsp;&nbsp;&nbsp;&nbsp;1.6&nbsp;<a href="#ls_breaking_libgig_license">Doesn't LinuxSampler illegally link against libgig?</a><br>
189 &nbsp;&nbsp;&nbsp;&nbsp;1.7&nbsp;<a href="#ls_breaking_license">Doesn't LinuxSampler illegally link against other libraries?</a><br>
190 2.&nbsp;General Questions<br>
191 &nbsp;&nbsp;&nbsp;&nbsp;2.1&nbsp;<a href="#aga">linuxsampler? qsampler? jsampler? libgig? liblscp? jlscp? ... hu?</a><br>
192 &nbsp;&nbsp;&nbsp;&nbsp;2.2&nbsp;<a href="#no_gui">Can I use linuxsampler without a GUI as well?</a><br>
193 3.&nbsp;Compilation / Installation<br>
194 &nbsp;&nbsp;&nbsp;&nbsp;3.1&nbsp;<a href="#install">What do I need to compile and install?</a><br>
195 &nbsp;&nbsp;&nbsp;&nbsp;3.2&nbsp;<a href="#compilarion_error">Compilation of LinuxSampler aborts with ...</a><br>
196 &nbsp;&nbsp;&nbsp;&nbsp;3.3&nbsp;<a href="#svn_checkout">How do I checkout from Subversion?</a><br>
197 &nbsp;&nbsp;&nbsp;&nbsp;3.4&nbsp;<a href="#compile_svn">How do I compile from Subversion?</a><br>
198 4.&nbsp;Setup<br>
199 &nbsp;&nbsp;&nbsp;&nbsp;4.1&nbsp;<a href="#examples_lscp">Are there example LSCP script files somewhere?</a><br>
200 &nbsp;&nbsp;&nbsp;&nbsp;4.2&nbsp;<a href="#dropouts">I get dropouts (click sounds, noise), what can I do about it?</a><br>
201 &nbsp;&nbsp;&nbsp;&nbsp;4.3&nbsp;<a href="#runtime_error">LinuxSampler aborts at runtime with ...</a><br>
202 <br>
203 </div>
204
205 <a name="commercial_products"></a>
206 <h3>Can I use LinuxSampler in commercial hardware or software products?</h3>
207 <p class="default">
208 You are NOT ALLOWED to use LinuxSampler source code, libraries or applications in
209 COMMERCIAL hardware or software products without prior written authorization by the
210 <a href="developers.html">authors</a>. <A HREF="downloads.html">See here</A>
211 </p>
212
213 <a name="commercial_music"></a>
214 <h3>Can I use LinuxSampler for commercial music production?</h3>
215 <p class="default">
216 Hell, yes! Every indirect commercial usage of LinuxSampler, which essentially means
217 using its audio output, can of course be used in commercial applications like music
218 productions, live shows, etc. Don't get us wrong, with the mentioned commercial
219 exception we don't want to restrict the normal user / musician, we just want to avoid
220 somebody to directly make money with our work, that is by selling our software in a
221 sampler product like a sampler + sample library bundle, a hardware sampler or
222 something equivalent, at least not without giving something back to the open source
223 Community.
224 </p>
225
226 <a name="open_source"></a>
227 <h3>LinuxSampler is not open source, you are evil!</h3>
228 <p class="default">
229 There are of course many definitions of the term "open source", but according to the
230 <a href="http://en.wikipedia.org/wiki/Open_source">definition on Wikipedia</a>
231 LinuxSampler is in fact open source, since you've got complete access to its source
232 code. So due to this fact, a normal user / musician is free to do with LinuxSampler
233 what he likes to do, he can even adjust and tweak every single part of the software
234 by modifying and compiling its source code. And just the fact that we want to avoid
235 our work to be directly exploited in commercial software or hardware products is
236 definitely not an "evil" intention. For the normal user / musician the commercial
237 restriction is even an advantage, since that way commercial actors are forced to
238 support this or another open source project either directly by coding or indirectly
239 by funding and thus increase development speed.
240 </p>
241
242 <a name="closed_source"></a>
243 <h3>Will LinuxSampler turn closed-source?</h3>
244 <p class="default">
245 No, LinuxSampler will remain open source. Again, the commercial exception is just to
246 prevent commercial exploitation by third parties that haven't contributed anything to
247 open source projects.
248 </p>
249
250 <a name="ls_license_change"></a>
251 <h3>I've heard the commercial exception of LinuxSampler was added at a certain version?</h3>
252 <p class="default">
253 No, the commercial exception in LinuxSampler's license terms were there since day one.
254 Even further it's not only there since the very first publicly available CVS
255 (developer) version of LinuxSampler, that commercial exception was even already in
256 Benno Senoner's proof of concept code called "EVO", which LinuxSampler was based on.
257 There was even a rumour that we would have manipulated CVS history to "pretend" this
258 exception wasn't added at a later point. Needless to say that this rumour is completely
259 false as well. Think about it! We're a group of developers spread around the world who
260 work on this project for fun and ideology in our spare time. Most of us contributed to
261 various other open source / free software projects. Do you seriously think we would
262 cheat on such an issue? Beside that you certainly find various people completely
263 unrelated to this project who still have early versions of LinuxSampler and / or EVO
264 and thus can confirm that this commercial exception was always there.
265 </p>
266
267 <a name="ls_breaking_libgig_license"></a>
268 <h3>Doesn't LinuxSampler illegally link against libgig?</h3>
269 <p class="default">
270 No! LinuxSampler does not "illegally" link against libgig, since the copyright holder
271 (in this case of libgig) has all rights of his work and thus is not bound to his own
272 license terms. The sole purpose of license terms is to grant other people certain
273 rights to use the work.
274 </p>
275
276 <a name="ls_breaking_license"></a>
277 <h3>Doesn't LinuxSampler illegally link against other libraries?</h3>
278 <p class="default">
279 No, the only library LinuxSampler links to that has license restrictions regarding
280 linking is libgig (<a href="#ls_breaking_libgig_license">see above</a>). Especially
281 LinuxSampler does not break Qt's license terms, since it does not link against Qt at
282 all.
283 </p>
284
285 <a name="aga"></a>
286 <h3>linuxsampler? qsampler? jsampler? gigedit? libgig? liblscp? jlscp? ... hu?</h3>
287 <p class="default">
288 There are currently seven subprojects in the LinuxSampler project; jlscp, jsampler,
289 libgig, liblscp, linuxsampler, gigedit and qsampler. linuxsampler is the core of the sampler, it includes the
290 sampler engines and audio and MIDI drivers. linuxsampler itself is decoupled from any
291 user interface. It offers a native C++ API as well as a network server (LSCP server) to allow to be controlled by
292 an arbitrary user frontend from an arbitrary place over a network connection or
293 (of course) locally from the same machine as well. This decoupled /
294 <a href="http://en.wikipedia.org/wiki/Backend">"backend"</a> design
295 of the sampler allows to run it even on a machine without any graphical interface,
296 without a Desktop, the machine doesn't even have to have a graphics card!
297 qsampler is the first <a href="http://en.wikipedia.org/wiki/Graphical_user_interface">GUI</a>
298 <a href="http://en.wikipedia.org/wiki/Frontend">frontend</a>
299 written for linuxsampler, it is written in C++ using the Qt
300 GUI library and thus can be compiled for various architectures and operating systems
301 without modifications of the source code.
302 gigedit is an instruments editor application for Gigasampler format files. You can
303 run it as stand-alone application or in conjunction with LinuxSampler. In the latter
304 case you can play and immediately hear all your modifications made with gigedit in
305 realtime.
306 libgig is a C++ library written for accessing Gigasampler files and DLS Level 1 and 2
307 files, that is for reading and (since version 3.0.0) also writing of those files.
308 libgig is used by linuxsampler to load Gigasampler files, it is used by gigedit to
309 load, modify and create new Gigasampler files and it <b>can</b> be
310 used by qsampler to retrieve additional informations about Gigasampler files. liblscp
311 is a C library written as a wrapper around the LSCP network protocol, thus to control
312 linuxsampler. It was originally designed to be used on both sides, that is on server /
313 backend side (linuxsampler) and on client / frontend side (e.g. qsampler). But it's now
314 only used on client side by qsampler at the moment. jsampler is another GUI frontend for
315 linuxsampler, it's written in Java and thus platform independent. jlscp is a library which
316 can be compared with liblscp, with the only difference that jlscp is written in Java and
317 liblscp in C. jsampler requires jlscp.
318
319 </p>
320
321 <a name="install"></a>
322 <h3>What do I need to compile and install?</h3>
323 <p class="default">
324 You should compile and install at least libgig and linuxsampler. As a beginner you should
325 definitely as well compile and install a convenient GUI frontend like either qsampler or
326 jsampler, whatever you prefer. qsampler depends on liblscp, so you have to
327 compile and install liblscp before starting to build qsampler. Also if you like to be
328 able to edit instruments, you should compile and install gigedit as well. The recommended
329 order to compile and install is:
330 <ol class="default">
331 <li>libgig</li>
332 <li>linuxsampler</li>
333 <li>gigedit</li>
334 <li>liblscp</li>
335 <li>qsampler</li>
336 </ol>
337 </p>
338 <p class="default">
339 Of course you can also install QSampler and JSampler side by side. So you can test and use
340 both at the same time.
341 </p>
342
343 <a name="compilarion_error"></a>
344 <h3>Compilation of LinuxSampler aborts with ... </h3>
345
346 <p class="default">
347 &bull;&nbsp;&nbsp;&nbsp;"<code>Required libgig version not found...</code>"<br>
348 <br>
349 This error might occur when running LinuxSampler's configure script. Make sure
350 you have the required libgig version installed. If you're compiling a Subversion
351 version of LinuxSampler you usually have to compile and install the current
352 Subversion version of libgig as well. Also note there are couple common mistakes
353 which let this error occur even after having compiled and installed the required
354 libgig version. Read
355 <a href="https://bugs.linuxsampler.org/cgi-bin/show_bug.cgi?id=29">this bug report</a>
356 about common mistakes and how you can fix them.
357 </p>
358
359 <p class="default">
360 &bull;&nbsp;&nbsp;&nbsp;"<code>can't find a register in class `GENERAL_REGS' while reloading `asm'</code>"<br>
361 <br>
362 This is caused by the inline assembly code for
363 <a href="http://en.wikipedia.org/wiki/SIMD">SIMD</a> optimization in older versions of
364 linuxsampler. You have to compile older versions of LinuxSampler (v0.3.3 and older) with
365 -O2 or -O3 to avoid this problem. Usually this is done by default, if not try:
366 <br>
367 </p>
368 <pre class="code">CXXFLAGS="-O3" ./configure
369 make</pre>
370 <p class="default">
371 Alternatively you could also disable all hand-crafted assembly optimization code by:
372 </p>
373 <pre class="code">./configure --disable-asm
374 make</pre>
375 <p class="default">
376 but the latter is definitely not recommended, as it will increase CPU usage a lot!
377 </p>
378
379 <p class="default">
380 &bull;&nbsp;&nbsp;&nbsp;"<code>../common/Resampler.h:142: error: memory input 2 is not directly addressable</code>"<br>
381 <br>
382 This was reported (<a href="http://sourceforge.net/mailarchive/forum.php?thread_id=9018347&forum_id=12792">1</a>,
383 <a href="http://sourceforge.net/mailarchive/forum.php?thread_id=9019467&forum_id=12792">2</a>)
384 to be a gcc/g++ version problem, in conjunction with the inline assembly code for
385 <a href="http://en.wikipedia.org/wiki/SIMD">SIMD</a> optimization in older versions of
386 linuxsampler. Make sure you got gcc and g++, both of version 3.3 or higher installed.
387 You can check this with:
388 </p>
389 <pre class="code">gcc --version
390 g++ --version</pre>
391 <p class="default">
392 In case you already got gcc and g++ of version 3.3 or higher
393 installed and it still causes the compilation error mentioned
394 above, try the following:
395 </p>
396 <pre class="code">export CC=`which gcc`
397 export CXX=`which g++`</pre>
398 <p class="default">
399 On certain systems however you still get this error in conjunction with older
400 versions of LinuxSampler (v0.3.3 and older). Fortunately newer versions of
401 linuxsampler are not affected anymore
402 (<a href="https://bugs.linuxsampler.org/cgi-bin/show_bug.cgi?id=34">read this for details</a>).
403 </p>
404
405 <a name="svn_checkout"></a>
406 <h3>How do I checkout from Subversion?</h3>
407 <p class="default">
408 The procedure of checking out the newest version from Subversion is described on the
409 <a href="downloads.html#svn">Downloads</a> site and on the
410 <a href="http://svn.linuxsampler.org/cgi-bin/viewvc.cgi/">web interface site
411 of our Subversion server</a>.
412 </p>
413
414 <a name="compile_svn"></a>
415 <h3>How do I compile from Subversion?</h3>
416 <p class="default">
417 The procedure for compiling from Subversion is the same for all subprojects, that is no matter
418 if you are compiling linuxsampler, qsampler, libgig or liblscp from Subversion, you need to
419 have the autotools (automake, autoconf and libtool) installed and compile it that way:
420 <pre class="code">make -f Makefile.cvs
421 ./configure
422 make</pre>
423 </p>
424
425 <a name="no_gui"></a>
426 <h3>Can I use linuxsampler without a GUI as well?</h3>
427 <p class="default">
428 Yes, but unfortunately there is no console based frontend for linuxsampler (yet).
429 You have to write LSCP scripts and send it to the running linuxsampler application. But
430 don't worry, if you don't know how to write LSCP scripts, you can also start by saving
431 a sampler session with QSampler, because the session files qsampler writes are actually
432 real LSCP scripts. You can send a LSCP script to linuxsampler on the console with the
433 following command:
434 </p>
435 <pre class="code">netcat localhost 8888 &lt; yourscript.lscp</pre>
436 <p class="default">
437 or on certain systems (like Debian) you have to provide the -t switch:
438 </p>
439 <pre class="code">netcat -t localhost 8888 &lt; yourscript.lscp</pre>
440 <p class="default">
441 Of course you can also replace localhost by the IP address of the machine where
442 linuxsampler is running. Alternatively you can also make a telnet connection (port 8888)
443 to linuxsampler's LSCP server and type commands manually.
444 </p>
445
446 <a name="examples_lscp"></a>
447 <h3>Are there example LSCP script files somewhere?</h3>
448 <p class="default">
449 Yes, have a look on the <a href="documentation.html">Documentation</a> site for some
450 common LSCP script examples. For details about LSCP read the
451 <a href="api/draft-linuxsampler-protocol.html">LSCP reference</a>. Be welcome to ask
452 questions for details about LSCP on the
453 <a href="http://lists.sourceforge.net/lists/listinfo/linuxsampler-devel">mailing list</a>.
454 </p>
455
456 <a name="dropouts"></a>
457 <h3>I get dropouts (click sounds, noise), what can I do about it?</h3>
458 <p class="default">
459 In order to achieve good results under Linux you need to have a
460 <a href="http://www.linuxdj.com/audio/lad/resourceslatency.php3">patched kernel</a>.
461 There are different patches available depending on what version (2.4.x or 2.6.x) of kernel you use.
462 The <a href="http://jackaudio.org/faq">JACK FAQ site</a>
463 (or the <a href="http://jackit.sourceforge.net/docs/faq.php">old JACK FAQ site</a>)
464 is also a good resource for
465 how to configure a realtime stable kernel. But note; LinuxSampler currently has not support for
466 libcap yet, that means if you are still using a 2.4.x Linux kernel you most probably have to run
467 LinuxSampler with root priviliges. As a rule of thumb: if you don't get warnings like "cannot
468 mlockall() memory" on the console, you are safe to run it as ordinary user as well.
469 </p>
470
471 <a name="runtime_error"></a>
472 <h3>LinuxSampler aborts at runtime with ... </h3>
473 <p class="default">
474 Note: For <b>Windows specific runtime errors</b>, please have a
475 look at the
476 <a href="windows.html#houston">Trouble Shooting</a> section of
477 the LinuxSampler Windows HOWTO.
478 </p>
479
480 <p class="default">
481 &bull;&nbsp;&nbsp;&nbsp;"<code>gig::Engine error: Failed to
482 load instrument, cause: Unknown exception while trying to
483 parse gig file.</code>"<br>
484 <br>
485 Usually LS gives you a meaningful error message in case it
486 failed to load an instrument. However there might be rare
487 cases where LS cannot resolve the reason and you get an
488 error message like above. In this case make sure security /
489 user limits aren't set too low. You can list your current
490 limits with:
491 </p>
492 <pre class="code">ulimit -a</pre>
493 <p class="default">
494 Usually most of those settings are set to "unlimited" on
495 most boxes. If this is not the case on yours, make sure that
496 at least the limits for "max locked memory", "virtual
497 memory" and "data seg size" are sufficiently high enough.
498 The exact value depends on the instruments you want to load.
499 If your security policy allows it, you could simply set
500 those limits to "unlimited" (see also config file
501 /etc/security/limits.conf and
502 <a href="https://bugs.linuxsampler.org/cgi-bin/show_bug.cgi?id=41">bug report #41</a>).
503 </p>
504
505 </div>
506 </td></tr></table>
507
508 </div>
509
510 </body>
511 </html>

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