I used the aftertouch to vary the filter cutoff level on the MIDI-channel.
(Rember to set Channel Aftertouch on). Then I adjusted the tone
with the TVF so that everything was filtered out/muted when the aftertouch
is pressed, and so that nothing is filterd out when no aftertouch
is pressed. Now I could mute/unmute by pressing hard on one key with
no tone assigned to it. Afterwards I used the event editor in the
sequencer to send aftertouch-messages at level 127 or 0 whenever I
wanted the sound effect to be muted or unmuted.

It's fun to play strings while the keyboard mutes the MIDI-channel
every 16th note. Add some drums and you sound like ZZ-Top. It's
like having the keyboard doing real-time quantising.
(Rember to set Channel Aftertouch on). 

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