Hi, I'm trying to do a very similar thing but modulating the audio from a file. I want to produce a stereo tremolo by using the sine amod effect, out of phase on the left and right channels.
LEN=0
OFFSET=0
PHASE=0
PHASE2=180
The following works for mono, producing the desired tremolo in mono: sox rd73_064__E4_082.flac x.flac synth $LEN $OFFSET $PHASE 2 sine amod 0.5
I thought the following would work for stereo: sox rd73_064__E4_082.flac x.flac synth $LEN $OFFSET $PHASE2 2 sine amod
$LEN $OFFSET $PHASE2
but I get a parameter error. Any suggestions?
Thanks!
On Wed, 3 Jun 2020 at 10:34, Dr. Thomas Tensi <t.tensi@xxxxxx> wrote:
Hello Darryl,
you wrote:
> [modulate a sine wave with another in SoX?]
What you could do as an easy approach is modulate a sine wave with a
tremolo. Assume a target bit depth of 24bit, a sample rate of 44.1kHz, a
carrier of 1500Hz with a length of 20s and a modulation of 0.5Hz with a
depth of 100%
sox -n -b 24 -r 44100 test.wav synth 20 sine 1500 tremolo 0.5 100
Tremolo can only do a sine modulation with a fixed phase of 90°.
Even more powerful is the cascading of synth effects. Same logic, the
carrier is amplitude-modulated by a sine with 0.5Hz with the same 20s
length:
sox -n -b 24 -r 44100 test.wav synth 20 sine 1500 synth 20 sine amod 0.5
If you don't want a full modulation (from 0 to 100%), you can add a
dc-offset to the second waveform.
Hope this helps!
Best regards,
Thomas
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