> In the past so-called pitch-change detectors were available that generated a
> trig pulse whenever the pitch (or any other voltage) changed. Usually the
> inverted signal with "on" in the neutral state was generated and a short
> reset to zero whenever the pitch changed. It's nothing but a high pass
> filter followed by a full wave rectifier (to recognize both positive and
> negative changes) and a gate shaper (e.g. to obtain a certain length, e.g. 5
> ms).

but for those not using a midi interface - i use a roland sh-09 for example - is there there a way to patch such a retrigger arrangement using modules already available

thanks,

stu