Everything here works more or less as it should
Now I need to put all thiese “modules” together, so I’m going to build the simpler mixer I can think of… That design is exactly what I think I need: http://www.experimentalistsanonymous.com/diy/Schematics/Buffers%20Switchers%20Mixers%20and%20Routers/Simple%20Mixer.pdf
Nothing better than the 808 kick as a first beatbox build, a solid foundation… There are many designs around based on the original service manual published by Roland, including all the schematics. https://archive.org/details/roland_Roland_TR-808_Service_Manual I got help from this one, as the original schematics have been redone at a larger scale: http://www.ericarcher.net/wp-content/uploads/2014/07/tr-808-bass-drum-diy-project.pdf Just be aware that you are going to need…
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The Hackadays series by Elliot Williams are a gold mine: Logic Noise: Sequencing in Silicon This is a super simple 8 steps sequencer based on the Baby 10 featuring two 4017 ICs. Here is my breadboard rendition of it gating the power of a 4069/40106 based oscillator: https://vimeo.com/259955613
I just love Electro-Harmonix phasers such as the Small Stone or the Electric Mistress.. I found these schematics to build a Small Stone replica using the CA3080 Operational Transconductance Amplifiers: http://www.tonepad.com/project.asp?id=11 The build on a breadboard looks like this: And the sound is great, here’s a demo using a great song by Adrian Nation, Five Fingers Rapid: