Re: Sine wave in an envelope

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

Jeff

On Mon, 8 Jun 2020 at 08:20, Jeff Learman <[email protected]> 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.
>
> Jeff
>
> On Mon, 8 Jun 2020 at 07:13, Dr. Thomas Tensi <[email protected]> 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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>>
>

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