The Synthanola punch-tape sequencer & synthesizer – an entry in the 555 contest – does its own version of Bach’s Inventions # 8 & 13.
The Synthanola is a three channel music synthesizer, not so well-tempered, capable of four octaves per chanel.
555′s are used to generate each octave for each voice (or channel). There are twelve 555 timer IC’s used for the synthesizer section and two more for tempo control and paper speed. It is sequenced by a Heathkit H-10 paper tape unit and programmed with a 486 PC running QBasic.
This set of videos, via Carlos Serafini, capture a laid-back micronal synth jam on a hexagonal control keyboard, Autumnal Modulations.
Here’s what Serafini has to say about the piece:
This song is both the first one I compose employing extensive modulations (with Carlos Gamma tuning system) and the first one completely transnotated.
Transnotation allows me to analyze my own compositions. To demonstrate that, I have recorded 2 short movies where I perform the ?lead guitar? part of portions of the original tune while listening to the pre-recorded ?bass? and drums parts and reading my transnotated score.
This guitar sound by Spectrasonics Omnisphere has already been featured on many songs of mine. I love it!
This video captures Lassus’ Ave Regina Coelorum, performed on the Hi-PiTonal Plexus keyboard.
This excerpt by Lassus (16th century composer) presents a puzzle for tuning with pure intervals, where the closing chord should be the same as the opening chord, but if strict theoretical rules are followed the closing chord will fall about a quartertone lower than the opening chord. The passage is played twice here on a 2 octave Tonal Plexus keyboard, showing how this pitch shifting occurs.
18-TET = 18 divisions of the octave instead of 12 (which is standard for western tuning). Special, special thanks to Abrasive for his help and his idea with this – all of the credit goes to him of course. On left, the original ROM with its frequency lookup table intact, and on the right the edited ROM with the 18-TET lookup table.