Ah, got it sorted:
LEN=0
OFFSET=0
LPHASE=40
RPHASE=90
FREQ=.75
For mono file:
sox in.flac out.flac remix 1 1 synth $LEN $OFFSET $LPHASE sine amod $FREQ $OFFSET $RPHASE sine amod $FREQ
For stereo file:
sox in.flac out.flac synth $LEN $OFFSET $LPHASE sine amod $FREQ $OFFSET $RPHASE sine amod $FREQ
OFFSET=0
LPHASE=40
RPHASE=90
FREQ=.75
For mono file:
sox in.flac out.flac remix 1 1 synth $LEN $OFFSET $LPHASE sine amod $FREQ $OFFSET $RPHASE sine amod $FREQ
For stereo file:
sox in.flac out.flac synth $LEN $OFFSET $LPHASE sine amod $FREQ $OFFSET $RPHASE sine amod $FREQ
Jeff
On Mon, 8 Jun 2020 at 08:20, Jeff Learman <jjlearman@xxxxxxxxx> wrote:
Thanks. Actually I'll have both mono and stereo cases, but was asking about the stereo case. Of course I can split the stereo into two mono files. I was hoping to do it in one line, which was the real question here -- the synth effect documentation says it can operate differently on different channels but I couldn't figure how to make that work.JeffOn Mon, 8 Jun 2020 at 07:13, Dr. Thomas Tensi <t.tensi@xxxxxx> wrote:Hello Jeff,
you wrote:
> > [similar problem as amplitude modulating a sine wave]
> I want to produce a stereo tremolo by using the sine amod
> effect, out of phase on the left and right channels.
I am not sure whether this can be done in one command, but you could
modulate the channels into left and right mono versions and combine
(merge) the file into a stereo file. I assume that your source is in mono?
To paraphrase your solution:
-----
INFILE=rd73_064__E4_082.flac
OUTFILE=x.flac
tempfileLeft=left.flac
tempfileRight=right.flac
LEN=0
OFFSET=0
phaseLeft=0
phaseRight=180
# sox command fragments
tremPrefix=synth $LEN $OFFSET
tremSuffix=2 sine amod 0.5
sox $INFILE $tempfileLeft $tremPrefix $phaseLeft $tremSuffix
sox $INFILE $tempfileRight $tremPrefix $phaseRight $tremSuffix
sox -M $tempfileLeft $tempfileRight $OUTFILE
-----
Is this what you wanted?
Best regards,
Thomas
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