Thanks everybody for the illumination!

So I changed the UDO to:

opcode schedulek, 0, Skk
	Sname, istart, idur xin
  redo:
	reinit redo
	schedule Sname, istart, idur
	rireturn
endop

and it worked as I'd initially expected.

Not quite sure abot the 'rireturn'.  If I'd left it out
would the calling instrument also have entered
an init pass?

Thanks,

	-- Pete --

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