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I'm surprised about this "double bang", but I suppose this means "do compute one audio block and only one" (here 1024 samples).
actually, i have NO idea why i needed to do the double bang. For some weird reason, a single bang was triggering the [switch~], but then the next bang did nothing. Only every second bang was triggering. So, i used [t b b] just to send 2 bangs and trigger every time.
if you remove one cable from one outlet of the [t b b], you will see what i mean.
not sure if there's a bug in the implementation, or what, but yeah...seems weird.
>I wonder if switching the DSP off does mess up with overlapping (as i understand "overlapping with previous audio block").
sorry, i don't actually know how the overlap is implemented, but I did some trial and error tests, sending various signals through the switched off subpatch, and through a subpatch with no [switch~] object. The outputs of each [env~] in the different subpatches seems to be the same.