[PD] Stopping an audio object

[Carlos Pita]

Hi!
I'm writing a subpatch as part of a synthesizer
which includes a number of signal sources
(each one an instance of the mentioned
subpatch) which are combined together.
Each source can be of a different shape:
sinusoidal, sawtooth, triangle, noise,
etc. The subpatch includes a generator
for each kind but only one of them is
selected at a given time. I'm not sure
if it is possible to deactivate the non
selected ones. I mean not to 0-multiply
their output but a control facility to
temporarily stop them so that they don't
do any dsp at all (obviously for performance
improvement).
Thank you in advance.
Regards,
Carlos.