ES5506 has these features:
- 16 bit independent volume register per left/right output (Logarithmic, 4 LSB is for envelope)
- Programmable filter per each channels, 4 pole, 4 filter mode and 2 16 bit coefficient register (4 LSB is for envelope)
- Hardware envelope
Add more than 2 macro type support
"Delta" macro type: Use delta from previous value