Thanks Dan. I'm looking at how this works now, so that I can maybe use it 
as a basis to work from.

Can you please answer this:

looking at the 'buildKeyboard' method, I can see where the mouse down event 
is picked up and handled using the

mouseDownEvent: event noteMorph: noteMorph pitch: midiKey

method. But I can't work out where the arguments come from. This is the 
line in buildKeyboard

on: #mouseDown send: #mouseDownEvent:noteMorph:pitch: to: self
                                                                 withValue: 
i-1*12 + (#(1 3 5 6 8 10 12) at: j);

ands I can see that this calculates the midi note number corresponding to 
the 'key' that has been pressed. But where do the arguments to 
mouseDownEvent: and noteMorph: come from?

Thanks again

Daniel


At 09:19 22/11/00 -0800, you wrote:
> >How do I use the internal FM sound generator to play sounds without
> >predetermined duration?
> >
> >That is, something like:
> >       aSound pitch: aPitch volume: aVolume play
> >       aSound stop
> >
> >I had a look through AbstractSound, LoopedSampleSound and various other
> >classes but couldn't seem to find anything that has protocol something like
> >'start' and 'stop'.
> >
> >But as this is how MIDI works, I guess it must be possible?
>
>Daniel -
>
>Yes it is.  You might want to look at PianoKeyboardMorph.
>It's a complete keyboard UI and synthesizer in 5 methods.
>
>         - Dan
>
>[the ability to drag along the keyboard which works in 2.8 is currently 
>broken in 2.9alpha, but I'll put out a fix soon]