I have to coordinate 5 audio exciters simultaneously.
I can't use the function tone() because it would require to use one exciter at the time.
but different amplitude.
what it is important is that all the 5 exciters emit a signal simultaneously.
Is it OK to use the amplifier's volume control, or do you need to control the volume with software?
If so look at this https://www.jeremyblum.com/2010/09/05/driving-5-speakers-simultaneously-with-an-arduino/
I need to control the volume through software adjusting it according to parameters that are read from other pins. The signals' frequency is the same for all the signals, the phase and the amplitude are the only things that change from one signal to another.
What sort of Arduino are you thinking of using?
What range of frequencies are we talking about?
The frequency must be 100Hz as indicated in the project specifics