Hi Rui :) > mono recording/playback in qtractor is perfectly possible provided you use > a mono audio bus (channels=1) for track input/output. > > otherwise, the default master buses are stereo (channels=2) and mono > signals are replicated on input and doubled on output. >
The default master buses should be stereo. Is Qtractor able to replicate the signal? > remember, wrt. qtrator, all your audio track's behavior is determined by > their assigned buses modes: recording will be mono if track's input bus is > mono, there playback will be replicated to each output bus channel. > > afaict, this pseudo-mono/stereo conversion should not introduce any > phasing artifacts as the duplication/doubling process is done in the very > same and precise computational audio period cycle. > I did it by JACK, connected the mono signal to both sides of Qtractor's input. > if some phasing can be possible heard, there must be regarded to be due on > and after the signal goes through D/A conversion. Then there must be phases for other signals too, the same if my mixing console or some cables would be phased. But the signal only is that bad, when I "convert" mono to pseudo-stereo by JACK connections. > maybe your monitors are > out of phase Even if the monitors would be out of phase, I routed the subgroups by my external mixing console to mono and listened to the signal by just one side of my headphones, that only has one speaker, so nothing could be out of phase in relation to something else, only the "layered" signals could be phased. But anyway, nothing of my equipment is phased ;). > or some other psycho-acoustics phenomena going in there, perhaps? :) > > cheers > No, there're definitive phases when a mono signal by one channel is connected by JACK to both channels of a stereo input. If JACK gets a mono signal already as pseudo-stereo and this pseudo-stereo signal is connected to a stereo channel, there are no phases. I won't report it to the JACK list, because it's useless if I report this. When I said JACK is producing noise to some people, before I was described to the JACK list, I was the troll, 2 years later a JACK coder noticed it and was the hero. If an engineer like me hears something he is always wrong, we need to wait if a coder notices something in the code, e.g. for the noise it was a rounding error IIRC. It was the same with the sync problem, when I noticed it, nobody was interested, it took a long time until other people, e.g. Daniel from 64 Studio reported the same problem for sync, before anybody was willing to listen. Btw. I'm running JACK2. I have to add that I sometimes run JACK with options that aren't fine with the hardware, but as long as there are no error messages and warnings, e.g. xruns, this shouldn't cause any trouble. Anyway, I used Qtractor to play note events and recorded the mono signal by Audacity. Because I don't have MIDI jitter when I use Qtractor with fluidsynth-dssi, I'm making soundfonts of some external synth. Okay, this mono issue seems to belong to JACK, but not to Qtractor. I still like Qtractor :), but had some crashes. I can't report exactly what caused the crashes, but there seems to be a coherence with plugins. At the moment I need to do other things, but I'll report when exactly this crashes will occur as soon as possible. Cheers, Ralf -- Secret of Tux: http://images.wallaceandgromit.com/user_uploads/forum_thumbnails/5/75/355.jpg "Gromit bit me" says HMV dog: http://img.dailymail.co.uk/i/pix/2007/03_03/GomitHMVPA_468x319.jpg _______________________________________________ 64studio-users mailing list [email protected] http://lists.64studio.com/mailman/listinfo/64studio-users
