I have recently recorded a test piece in Rosegarden, consisting of a
full-scale arpeggio with rests between the notes, using my own software
synth. This was for subsequent audio analysis. I noticed that the
waveforms looked odd, compared to my expectations from the synth patch I
used. In particular, I saw an extra "tail" to each note release, about
50 msec long and about 10 dB down, which indicated to me that there was
an echo of some sort, which my synth could not produce. I double-checked
that my synth was not producing this artifact, by writing samples to a
file as I output them to the Jack buffers.
Is it possible that the output from the recording is somehow being
re-recorded? I am wondering if I have failed to mute something, or
whatever. I have played around with the mute and record buttons on each
channel, to no avail.
From: D. Michael McIntyre <michael.mcintyre@ro...> - 2007-08-16 22:08:54
On Thursday 16 August 2007, Glyn Adgie wrote:
> Is it possible that the output from the recording is somehow being
> re-recorded? I am wondering if I have failed to mute something, or
> whatever. I have played around with the mute and record buttons on each
> channel, to no avail.
JACK routing. I can't think of exactly what causes this, or how I fix it (and
it will vary with your hardware anyway), but it has to do with disconnecting
something that Rosegarden hooks up that way because it's the right thing to
do for "most systems."
Sorry I'm being so vague. Play around in QJackCtl and see if you can't break
the connection that causes this weird echo.
D. Michael McIntyre
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