The Whisper EMG simulator was discontinued by Roessingh Research & Development in 1999 after the Windows 3.0 software supplied with it became unsupportable under later versions of Windows. However the Whisper is a very nice piece of hardware and reliably generates a clean EMG test signal sequence that allows the user to quickly test and verify the performance of any EMG system. I've recently been asked to repair a dead Whisper unit and it turns out that all it needed was a new 4xAA battery holder.

If anyone has a Whisper that needs repairing then you are welcome to contact me.