I built the OpAmp oscillator with 5 button each triggering different note (calculations for the resistor values are in the photo below). Then I built another OpAmp oscillator to use as a vibrato: it would make the LED pulse, and the LED and a photocell, which controls the frequency of the other oscillator, is covered with electrical tape, so the LED would control the pitch of the oscillator.
However, nothing in this circuit seems to work. I think the problem is the power source, but I am not sure of it. I am still trying to fix this circuit.
After I get this to work, I am going to make a tremolo using the VCA, oscillator(s) with 555 timer for droning tones, and a mixer to mix the sound from OpAmp oscillator and 555 timer oscillator.
However, nothing in this circuit seems to work. I think the problem is the power source, but I am not sure of it. I am still trying to fix this circuit.
After I get this to work, I am going to make a tremolo using the VCA, oscillator(s) with 555 timer for droning tones, and a mixer to mix the sound from OpAmp oscillator and 555 timer oscillator.