Paul D. DeRocco wrote:
> ... But the analog output has a post-DAC volume control which I'd like to
> control from my synth app.
>
> Can anyone tell me how to do this?
Find out the name and the valid range of that mixer control, then
just execute:
system("amixer cset name='Master Playback Volume' 42");
or access the control directly like this:
#include <stdio.h>
#include <stdlib.h>
#include <alsa/asoundlib.h>
static void check(int err, const char *f)
{
if (err < 0) {
fprintf(stderr, "%s failed: %s\n", f, snd_strerror(err));
exit(EXIT_FAILURE);
}
}
#define CHECK(f) check(f, #f)
int main()
{
snd_ctl_t *ctl;
snd_ctl_elem_value_t *value;
CHECK(snd_ctl_open(&ctl, "default", 0));
snd_ctl_elem_value_alloca(&value);
snd_ctl_elem_value_set_interface(value, SND_CTL_ELEM_IFACE_MIXER);
snd_ctl_elem_value_set_name(value, "Master Playback Volume");
snd_ctl_elem_value_set_integer(value, 0, 42);
CHECK(snd_ctl_elem_write(ctl, value));
snd_ctl_close(ctl);
return 0;
}
Regards,
Clemens
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