I took the LPC-810 and wrote a MIDI based dsp synthesizer on it.
44.1KHz/16-bit PCM audio with sigma-delta DAC.
15 DCO analog modeling synth with 24db resonant lowpass filter.
It's at The dsp-G1 Analog Modeling Synthesizer | Indiegogo
Yes, I tried it on the ATmega and it works but there isn't enough horsepower to make it hifi.
No, It doesn't use wavetables. All waveforms are algorithmic.
Yes, it uses a sigma-delta DAC, 16-bits/44.1KHz on a digital pin and not PWM.
No, it doesn't have analog inputs so the boxed synth uses an Arduino Pro Micro to scan the knobs.
Yes, without the knobs the whole synth fits inside the MIDI-plug and uses phantom power 
I know what you guys are thinking seeing the 8-pin DIP, I can do that on a ATtiny.
Yes, you can.
But belive me, the ATtiny has nowhere near the horsepowers needed to do something like this.
It will sound like a toypiano.
Do you know any introductions to 'analog modelling' that I could have a look at online ?
Thanks
Duane.
DuaneB:
Do you know any introductions to 'analog modelling' that I could have a look at online ?Thanks
Duane.
I used to do a lot of programming with VSTs on the PC before doing it on an MCU/DSP.
Reading a lot online about FIR filter implementations.
The DCO is implemented like a filter but with feedback.
I have the FIR filter code posted here on the forum for the ATmega.
The filter is actually a number of multiplications.
Got it featured at Hackaday.