> the Update function in the File menu ..is it supposed to update the file?
It means "update from disk" -- sometimes the sound file changes due to
some other program, and if you don't have auto-update set, you need
to update the Snd program's view explicitly. Use 'Save' or 'Save as'
if you want to write out the current edits.
One way to apply a filter to a selection and ramp in and out of it is:
(define* (filter-selection-and-smooth ramp-dur flt :optional order)
(let ((temp-file (snd-tempnam)))
(save-selection temp-file)
(let ((selsnd (open-sound temp-file)))
(filter-sound flt selsnd)
(let ((tmp-dur (samples->seconds (frames selsnd))))
(set! (sync selsnd) (1+ (sync-max))) ; make sure env-sound hits all
chans
(env-sound (list 0 0 ramp-dur 1 (- tmp-dur ramp-dur) 1 tmp-dur 0) 0
#f 1.0 selsnd)
(save-sound selsnd)
(close-sound selsnd)
(env-selection (list 0 1 ramp-dur 0 (- tmp-dur ramp-dur) 0 tmp-dur
1))))
(mix temp-file (selection-position) #t #f #f #f #t)))
;;; (filter-selection-and-smooth .01 (make-one-zero .5 .5))
I think you could also set up the filter you want in the control panel,
then use (filter-selection-and-smooth .01 (filter-control-coeffs)), but
I didn't try it.
I'm not using the more elegant (or readable) sample-readers here because
a selection can be scattered over any channels of any sounds, making it
messy to keep track of everything.
To swap channels, see swap-channels. I'll try to get to the other questions
later.
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