MATRIXSYNTH: rare birds: Welson Ritmo / analog drum and accompaniment unit


Tuesday, November 07, 2023

rare birds: Welson Ritmo / analog drum and accompaniment unit


video upload by ohm_studi_ohm

Also see this one from 2022 with a smaller keyboard controller.

"The Welson Ritmo was a accompaniment unit intended as an add-on to some of Welson's organ line. It consists of a rhythm unit, a bass section, a chord section and an arpeggiato section. All sounds are of course fully analog. It is very similar in features and sound to the Elka Wilgamat, Böhm Böhmat and Wersi Wersimatic CX1. They are actually built around the same chipset family (SGS M2xx), but the Ritmo cannot be programmed.

It was never intended as a standalone unit so I built a custom keyboard to make it so.

Unit is very easy and straightforward to use with some nice features: for instance you can play it in "free chord" or 'one finger chord'. In the first mode you need to make a 3 notes chord to trigger the arp sound. With one or 2 notes you only trigger the bass and chord sounds, this make for some nice performance variations. The bass section can be set to 'walking bass', and in this mode you also need 3 notes to trigger the melody.

In 'one finger chord' you play a major chord with one key. There is a pedal input on the back to make the chords minors. I also added a switch on the keyboard to alternate between major and minor chords when playing in the "one finger chord" mode.

Other nice features are "keystart" (obvious functionnality) and 'memory' which holds the played notes (and rhythm). And like almost all the preset rhythm units you can combine different rhythms together."



Pics via SALES.OHMSTUDIOHM@GMX.FR

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