Atari Punk Console - exploring a classic circuit

When I was refreshing my understanding of the good old 555 a few weeks ago, I spotted the Stepped tone generator in Forrest Mims' classic book.
Today I'm going to explore that cool sound maker

The Forrest Mims 555 book: https://archive.org/details/555-designs


Here are a handful of actual musicians who do a good job of showing this thing's musical capabilities:

Notes and volts:
   • Atari Punk Console  

Haze anderson:
   • Atari Punk Console and 4093 Chaos NAND - L...  
   • #jamuary2022 Day 5 - Synthrotek Atari Punk...   (with autotune)

O.S.cillator    • Back to Noise! / Rhythm Drone Live Mini Ja...  

Expensive Notes    • #Jamuary 2023 - Baby8 Sequencer with Atari...   (1:37)

Sid Rockett    • Invaders Must Die (Atari punk console) demo  

LOOK MUM NO COMPUTER    • WORKING ENDING   (5:46)

Animoscillator    • Synthrotek APC - Atari Punk Console - EHX ...  



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This isn't the only way to do it.
It's probably not the best way to do it.
But it's how I did it.