Square wave adding synthesizer - part 2: The envelope generators and LFO
The demo starts at 4:20
I have made several envelope generators before, but this time I will try something that is new to me: Making an ADSR generator with no release knob but instead a switch where you can choose between (almost) zero and "the same as decay". It makes the envelope generator simpler (and therefore easier to make) and it was sometimes used in the 1970s - amongst others on the MiniMoog.
The music is a little thingy I put together on my Technics SX-C600 organ last year.