Yes, I've also noticed this flaky behaviour.

I usually write it like this (bypassing the button's internal instr
event trigger)
kOn, gihOn FLbutton	"On", 1, 0, 2, 90, 20, iButn1PosX, iButn1PosY, -105, 0
ktrigOn		trigger	kOn, 0.5, 0
schedkwhen	ktrigOn, 0, 0, 103, 0, -1	; activate instr 3
ktrigOff		trigger	kOn, 0.5, 1
schedkwhen	ktrigOff, 0, 0, -103, 0, 1	; turnoff instr 3

best
Oeyvind

2007/11/12, joakim@verona.se <joakim@verona.se>:
> I want to make some simple instruments that are controllable with both
> midi and fltk widgets.
>
> I hade some sucess with sliders being controllable with midi, but
> having unexpected difficulty with buttons.
>
> Is simply want to press a fltk button, and trigger an instrument. When
> I uncheck the button, the instrument should end, just like when
> pressing a midi keyboard note.
>
> The manual page for FLbutton  seems to suggest that the instrument is
> triggered when the button is checked but not when it is unchecked. I
> get the behaviour that the instrument is triggered both when I check
> and uncheck a button.
>
> --
> Joakim Verona
>
>
>
> Send bugs reports to this list.
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
>