Akai AX-60 Synthesizer Filter Resonance

August 19, 2012 · Posted in Uncategorized 

A video discussing & demonstrating some design aspects of the Akai AX-60 analog synthesizer, in particular the filter resonance.

The AX-60 has been described as capable of some very ‘industrial’ timbres and one reason for this is the very strong filter resonance of the cem3394 voice chip. The design choice by Akai to use a full 5V CV for the resonance brought this out. Additionally, they used a linear taper slider for resonance, and a linear 5V response to the CV (they could have used a log taper, like I did here, or they could have processed the panel voltage and did a voltage taper conversion in firmware – cheaper! – to limit the resonance CV to the range in the cem3394 data sheet, but they didn’t).
These design choices meant many users probably ended up exploring a more ‘brash’ part of the AX-60′s sound palette than if Akai been more like Sequential Circuits in their limited internal programming of the cem3394.

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