Comment 5 for bug 36326

qsampler depends on liblscp, which needs to be a depends, as qsampler is essentially a GUI wrapper for LSCP. This bug is related to the fact that qsampler doesn't do much if linux sampler is not installed on a network accessible machine (or the local machine for simple configurations). The linuxsampler license is somewhat confusing (claimed GPL, but with an additional non-commercial clause), which led to Debian bug 328121, and removal.

qsampler is GPL, and there is no reason for it not to be present, but users are currently expected to prepare their own local linuxsampler to make use of qsampler. If the linuxsampler license is clarified, and it is again distributed by Ubuntu, qsampler should recommend linuxsampler. Until then, it shouldn't (as this would cause unsatisfiable recommends).