NE555 Counterless sequencer - 3: Radio buttons, transpose function, final assembly, and a demo video

video upload by organfairy

"The demo is in 3 parts: Manual mode 4:15, Sync mode 9:46, and external mode 14:07

'Radio buttons' is an expression used for a row of buttons where a button stays down when you press it. You press another button and the first one will pop up again while the other button stays down.
It is possible to make such a device with simple pushbutttons and a few logic gates instead of the complicated (and expensive) mechanical locking switches. This is what I explore in the beginning of this video - and it is actually exploring since I haven't used the concept before so I didn't know if it would actually work. I do know that the old Moog Taurus bass synthesizer used a similar idea for its preset buttons.

The music is also a kind of exploration project since I decided for the first time to (over)use the portamento function on my Elka X-30 organ in an arrangement. Apart from the organ I also use my Roland JV-35 for some of the parts"