Drum trigger for ARP Odyssey?

[Robert Williams]

Years ago I saw a guy epoxy a small radio speaker to the underside of a
congo drum head.  The idea was to use this as a simple pickup for a
trigger mechanism.  The leads from this speaker he fed to some kind of
bread board which he used to trigger his ARP Odyssey for drum effects.
Does anybody have schematics for this kind of bread board?  Would just a
Trigger work, or would there need to be a CV voltage too?

Robert