Here is a line-by-line explanation of Example Program 2. For now, we are interested in how the three voices are controlled.

LINE-BY-LINE EXPLANATION OF EXAMPLE PROGRAM 2:

Line(s)	Description
10	Set S equal to start of sound chip and clear all sound chip registers.
20	Dimension arrays to contain activity of song, 1/16th of a measure per location.
30	Dimension array to contain base frequency for each note.
40	Store waveform control byte for each voice.
50	Set high pulse width for voice 2. Set high frequency for filter cutoff. Set resonance for filter and filter voice 3.
60	Read in base frequency for each note.
100	Begin decoding loop for each voice.
110	Initialize pointer to activity array.
120	Read coded note.
130	If coded note is zero, then next voice.
140	Set waveform controls to proper voice. If silence, set waveform controls to 0.
150	Decode duration and octave.
160	Decode note.
170	Get base frequency for this note.
180	If highest octave, skip division loop.
190	Divide base frequency by 2 appropriate number of times.
200	Get high and low frequency bytes.
210	If sixteenth note, set activity array: high frequency, low frequency, and waveform control (voice on).
220	For all but last beat of note, set activity array: high frequency, low frequency, waveform control (voice on).
230	For last beat of note, set activity array: high frequency, low frequency, waveform control (voice off).
240	Increment pointer to activity array. Get next note.
250	If longer than before, reset number of activities.
260	Go back for next voice.
500	Set Attack/Decay for voice 1 (A=0, D=0). Set Sustain/Release for voice 1 (S=15, R=0).