There should be easy-to-find buttons to start and stop the sound (by controlling the output amplitude), as well as teh control to change the rate. If you've done it right, using a negative number for the rate should reverse the order the three pitches rotate in.

To do this you might need to:

• use a 'loadbang' object to initialize a number box
• use a text message to an array to get numeric values into it (see help for arrays)
• use the 'tabread~' object to get values out of an array as an audio signal

It should sound like this.

For extra credit, make alternating tones have two different timbres, one sinusoidal, the other a hand-drawn waveform. Since the pattern of pitches is three long, the whole thing will only repeat after six notes in stead of three. To do that you might need to:

• make a network that cross-fades between two audio signals
• use the tabread4~ (or tabosc4~) object to oscillate with a given waveform;
• use a third table (interpolating so you don't get clicks) as a signal to control a cross-fade.

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