LeonSound capabilities are not advanced in Lion but...
I increased the sound channels to 3 and added 255 step 8bit digital volume control for each one.
A channel outputs a square wave signal with frequency obtained by dividing 200khz by a 13bit number.
A channel can be mixed with the white noise (lfsr) channel, noise comes with a frequency bandwidth limit.
Every channel can be enabled with 8 different duration values 2sec, 1sec, 0.5 sec, ....
Status of any channel is available to determine if it has finished playing the previous note in order to send it a new note but a channel can be interrupted any time to start a new note.
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