Thanks for the links, your PhD sounds promising. Not sure which machine came first, but around the time of the UPIC system you mentioned the Fairlight CMI was

Thanks for the links, your PhD sounds promising. Not sure which machine came first, but around the time of the UPIC system you mentioned the Fairlight CMI was released, which (amongst its other functions) allowed users to draw out waveforms using a lightpen: https://en.wikipedia.org/wiki/Fairlight_CMI#CMI_Series_I https://en.wikipedia.org/wiki/Fairlight_CMI#CMI_Series_I This video shows Peter Gabriel playing around with a Fairlight CMI, from what I remember I don't think it shows the waveform drawing but it gives some idea of what it was capable of: https://www.youtube.com/watch?v=ON8lVgJxMQA https://www.youtube.com/watch?v=ON8lVgJxMQA