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This video is a demo of a modded Linn LM-1 - a classic drum machine that is even more flexible with the mod, which adds tuning pots to the front panel.

hard plAYer is an DIY 8 bit tunes hardware player, which allows you to listen to the same melodies you could listen to in some of the 80’s home computers and videogame consoles. In future versions, it will also work as MIDI synthesizer.
Its audio sound generator porcessor is the General Instruments AY-3891X - the same one that [...]

This is a cool video demo via audiolemon of an interesting DIY touchscreen drum machine project. The audio & video are a little raw, but you can see this project has potential.
Here’s a high level explanation of how this was put together:

Remember filling in those little ovals on tests in school with #2 pencil?
Now you can do something really fun with a #2 pencil!
Drawdio is an electronic pencil that lets you make music while you draw.
It’s an easy DIY project that lets you create a basic musical synthesizer that uses the conductive properties of pencil graphite [...]

HIghly Liquid has introduced a kit that lets you control a Casio VL-1 “VL-Tone” via MIDI.
The new VL-1-MIDI retrofit kit is based on the UMR and includes custom firmware for the VL-1.
The kit retails for $40.95.

Eric Archer’s ABot (Another Box o’ Techno) is an interesting collection of DIY experimental synth circuitry. 
It features:

Dual VCO w/ digital sub-bass sinewave
12dB/oct VCF
SyncLFO
LFO-Sequencer
WaveFucker (1-bit pitch shifter)
Analog-controlled speech synthesizer
Generative CV sequencer for melody control

The ABot synchronizes with Archer’s BBoT (Big Box o’ Techno).
Continuing with Archer’s BBoT ethos, there is no computer interface, storage, MIDI, etc.  Improvisation is the only [...]

 

 ABoT bassline + BBoT drums - 3 [1:24m]: Play Now | Play in Popup | Download

Over at Making of a Drum Synth, Philipp posted this video demostrating the sequencer of his diy drum synthesizer project.

Flight of Harmony is offering a barebones kit for their Plague Bearer synth module, designed to infect, corrupt and pervert a signal beyond recognition. 
Each filter has controls for varying the high and low corner frequencies of the passband, as well as variable gain and an input attenuator. It can be used as a filter, an oscillator, a [...]