This looks interesting. I'll give it a try & let you know!Here is the schematic I came up with which you will need to do some adjustments to for the right tone. The 556 timer is used to produced 2 tones which you can vary by changing R2 and R4. I just realized that C5 should be 1 μF and not 0.1 pF. R6 will vary the length of time the volume decreases over. R8 and R9 should be the same as R2 and R4. This will change the square wave to a sawtooth wave with nearly equal rise and fall times. R10 will control the volume as well as the feedback amplification of R15 and R16.
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