I've read everything I can find about the blocking callback function for SndPlaySmf, but I can't find the answer to this: the OS calls the function "periodically while the sound is playing". How often? Is the period regular? Is it the same for all MIDI files? I would like to flash the backlight on and off while I play a MIDI sound, and I think the blocking callback is the right way to do it. Am I on the right track? -- Roger Chaplin <[EMAIL PROTECTED]>
