Tsumara JD21 restoration
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Re: Tsumara JD21 restoration
Neato!
- resistorman
Frequent Poster (Level2) - Posts: 2679 Joined: Sun Nov 22, 2015 12:00 am Location: Asheville NC
"The Best" piece of gear is subjective.
Re: Tsumara JD21 restoration
I've found my niche, which is asking someone else to rebuild these gadgets rather than trying to do it myself. I can just dream up a fingering chart and a few extra functions and send off an email. Bliss.
I've requested this as the default layout, chromatic over two octaves. I think that'll fall under the fingers OK.
(By the time the manual has been fed through Wayback and Google Translate, it's difficult to find out what the original settings were.)
I've requested this as the default layout, chromatic over two octaves. I think that'll fall under the fingers OK.
(By the time the manual has been fed through Wayback and Google Translate, it's difficult to find out what the original settings were.)
Re: Tsumara JD21 restoration
I'm not sure how this one has been done (I'll ask), though people often use a "button matrix".
https://www.embeddedrelated.com/showarticle/519.php
https://learn.sparkfun.com/tutorials/bu ... -guide/all
This has come together faster than I expected. It's already playable (USB MIDI) together with display and pitchbend.
Re: Tsumara JD21 restoration
Most digital systems that feature more than a moderate number of user switches would organise them as a scanned matrix with each switch connecting together a unique combination of row and column.
With this sort of arrangement one could accommodate, for example, 64 switches with an 8 row by 8 column matrix. An explanation of this with a music tech relevant example can be found here. The examples show the columns being driven by microprocessor outputs with the rows as inputs.
John
Re: Tsumara JD21 restoration
It's also done for low res analog controls. In the past, I've used HEF4066 to do this.
- Folderol
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Onwards and... err... sideways!
Onwards and... err... sideways!