quid beepy keyboard

[boneless]

( DISCLAIMER: I'm fairly new this - and I'm not saying it's a great bend or anything but I thought me posting might help inspire other newbies!)

I got one of these in a pound shop the other day. Mainly bought it coz I liked the look of it.

When I got it home I almost didn't bother bending it coz it sounded so monophonic beepy and awful but eht notes do have this interesting kinda fade out to them, so I did open it up and it became a bit of a project...

Found three bends. Pitch up, a kind of extend the note one,  and a shorten and make more beepy one. Put pots in and line out.

Then got really inspired by Silas's linked post about 555's and built my first triggger circuit!!  Put on/off switch for that  and routed the pulse through a spdt switch so it can trigger two different notes with a pleasant 4th interval.

Pretty chuffed that it works so thanks to all for encouragment!

Noticed a few things though...

Firstly the 555 doesn't trigger a completely even pulse. The timing sorta shifts on it. I wondered if that was normal? Of do I need to change values of compoinents on the 555 circuit?

Also

 ...whilst using the trigger circuit plus bends one time it started to totally spin out and kinda alternate a note up and down like a wave form- with crazy distortion - for quite a while. MAD. It kept doing it until I'd taken batteries out a few times and left it for a few minutes. Then it went back to normal. Something similar happend once when I was probing it.

Anyone any ideas what was happening?

Have been trying but haven't got it to happen again!!!

Also when I plug in line out and cut the signal to internal speaker it looses the fade out reverb of the sound and goes bippy.

I haven't put any resistors in teh line out - perhaps a 10k in the  line out ground would solve it? Anyone any ideas?

Thanks again for the forum. It's opening up a whole new world of musicality.