MATRIXSYNTH: Instruō - Befaco FX Boy - microPhaser cartridge | All-pass filter tutorial

Wednesday, October 18, 2023

Instruō - Befaco FX Boy - microPhaser cartridge | All-pass filter tutorial

video upload by Instruō

"Here's something a bit different!

Befaco ( have launched this very cool module which uses the "game boy" cartridge form factor as a means of hot swapping analogue and/or digital circuitry as effects processors.

I caught up with Manu and Diego at Superbooth23 and learned of this mad idea. I very quickly asked how I could get involved and contribute a cartridge design.

Time was a bit of a crunch.
I set the target of a month following return from Berlin as a timeframe for getting a cartridge production ready.
Challenge accepted!
I believe I had the first two (heavily circuit bent) prototype cartridges in the mail to Barcelona in just over a fortnight.
The last 5 minutes of this video shows a bit of this process designing the first prototypes.

The FX Boy ships with 7 carts in total designed by a wonderful range of creative developers.
I'm very excited to be part of this project.

This video goes through some of the capabilities of my microPhaser effect and ends with some behind the scenes recordings of the rapid development of the circuitry.

00:00 Instruōduction
00:59 What is it?
03:21 microPhaser
04:23 All-Pass Filtering
07:06 Interference patterns
08:50 Phase Modulation
10:59 That's not a Sawtooth wave...
14:18 It's (not) just a phase
15:37 Winston interrupts
16:01 Complex Audio
19:57 Feedback/Resonance
25:16 Back in time (2023-05-12)
25:33 Making the microPhaser
27:58 Winston walk time
29:08 Circuit Bends
30:23 Testing the prototype"

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