Oh man I'm so close!
Just getting the power supply and reset sequencing stable then boards are done. Other than that they already work - just that they don't consistently reset properly when power is applied (USB jack plugged in). That should be finished in 1-2 weeks (those boards are on order). So boards ready for shipping in 1 month perhaps?
Then I'll take orders and in parallel start making them in low quantities (hand assembled in lots of 10 until I can scale up ... if there's demand). $50 each for the small board. Maybe $50 for the demo board with audio codec, I2C ADC, pots, audio jacks, etc. So $100 for both. A web site is being made where you can add this stuff to your cart and pay/checkout.
In the meantime I'll start making application notes for board usage to demonstrate using pots as tone/volume knobs, low-frequency oscillators, up/down sampling, real-time adjustable EQ's, IR processing (cab sim), etc.