Tandberg instrumentation recorder controlling a synthesizer

video upload by A Radiophonic Shed

"This Tandberg Series 115 instrumentation recorder is a scientific logging device from the 1970s.
Voltage changes detected from scientific instruments are recorded as frequency-modulated signals to four separate tracks on ¼" magnetic tape. When the tape is played back for analysis, those same voltages can be examined - replaying the experiment.
Here we have recorded 1V/octave pitch voltages from a keyboard, and now we're replaying those same voltages into a modular synthesizer - all the sound is coming live from the synthesizer, it isn't an audio tape recording.

More details: https://shedsynth.wordpress.com/2026/..."

And a short video featuring the Tandberg as a VCO along with a full view of the front:

Tandberg 115 as a VCO – electronic music from old test equipment

video upload by A Radiophonic Shed

A Relic From The Roots Of Electronic Music - Oramics on NPR

Listen On All Things Considered

"The Oramics machine is the creation of Daphne Oram, the first director of the BBC's Radiophonic Workshop and a central figure in the evolution of electronic music.

'Forget everything you've ever known about synthesizers. This machine has no piano keyboard or anything like that. It looks like the sort of thing that a mad inventor would make in his shed.'" [her shed - mad inventor Daphne Oram below left]

This one in via timelord. Be sure to see the Oramics label below for more.