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From: Frank N. <bea...@we...> - 2017-01-09 22:32:15
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Hi list, I was experimenting a bit with Linuxsampler and sequencer64 yesterday, and found a little oddity (two, actually): I have loaded a .sfz with a couple of synthetic drum samples into LinuxSampler (version LinuxSampler 2.0.0.svn31) and send "4-to-the-floor" kick drum MIDI events to it via sequencer64 (output device from LinuxSampler is JACK). Though the events are identical with regard to velocity etc, I can clearly hear that the samples produced by LinuxSampler are varying slight every now and then in their attack phase. There is roughly 1 "different" (harder, more direct) kick drum in every 8 or so events. This is NOT due to some round-robin scheme; there really is only one Kick drum .wav file assigned to this key. Also, I observed no JACK xruns while testing this. This is the corresponding line from the .sfz mapping this kick drum: <region> sample=..\..\..\wa_drum_tools_01_deluxe\drum kits\deep sleep kit\dt01_kits_deepsleep_kick808.wav lokey=36 hikey=36 end=17616 pitch_keycenter=36 amp_veltrack=71.653542 ampeg_decay=200.199997 ampeg_release=200.199997 pitchlfo_freq=5.000919 That original .wav file is also attached. I grabbed a short recording via jack_capture and looked at the resulting .wav in a wave editor; here I clearly see why the sounds really sound different (see attached pictures: orig_wave.png is the original .wav file, "soft_wave.png" is one of the (frequent) samples with somewhat softer attack (is there any AMP envelope applied to every sample at playback?) and "hard_wave.png" is one of the (more rare) sample playbacks with stronger reproduction of the original sample's attack phase. So, there are really two questions in this: - Why is the playback not giving constantly the same audio output? Could this actually be a bug? - If there is some kind of AMP envelope automatically applied upon each and every sample playback (perhaps to avoid the "onset clicks"?), how can I disable it to be sure my original sample's playback is authentically reproduced? Thanks, Frank |