Instrument-a-day 27: semi-automatic bass

This one didn't really work out. It was supposed to be a sequel to last year's automatic tension guitar, but it doesn't work or sound nearly as good. I'm experimenting with cheap substitutes for the little clapper solenoids I used last year, which are now really hard to find, but so far the results are bad.

And it's not even automatic! I didn't get around to rigging up a computer interface, so I'm playing it with the funny little wooden keyboard you can see at the upper right. It sounds like this.