William Coakley

A Simple Test For Good A/D D/A Converters.

04/29/2025
INTRODUCTION Evaluating converters is a somewhat subjective art like evaluating amplifiers and speakers. But hitherto, no one to my knowledge has ever published a quick and easy way that just happens to be the best way to evaluate converters. I know you're probably expecting some hi tech talk with an...

Roland’s A90 Controller

04/28/2025
The A90 appears to be measuring its velocity from the counter weight... a neatidea but is it good physics? Somewhere between the mechanism and the codethat interprets its movement is the problem. This review is based on A90 serial# 2K16708 H How is the key stroke made into a midi...

What Makes My Pianos Different

04/27/2025
Over the years, I've been asked this question a number of times and my answer came quite naturally from the beginning of my business in 1993. My pianos are different because, I answer the phone, I sign my name and serialize every disk I sell, I make the disks, I...