Ralph Jr

video upload by Stromer Mutroniks

Follow-up to this post, and currently listed on Reverb.

Stromer Mutroniks Ralph Junior

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via this auction

"Simple modular synth I've [Stromer] worked on and with for the last few years.

1 Voltage Controlled Oscillator 1 Ladder filter 2 ADSR Envelope generators 1 Voltage Controlled Amplifier

The size is 5U 19", and is rack-mountable."

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Stromer Compusound

video upload by akestromer

Guitar demo, but making the exception for this as it's from stromer and related to the Mutron III as well as previous posts below, not to mention it looks cool.

"Frogg Compusound knockoff project
It's like a Mutron III, but different.

Still a work in progress. I think I've got the computer part down, now I need to make the filter sound a little sweeter.

Be nice."

https://reverb.com/shop/stromer-mutroniks

Arduino based MIDI Drum Sequencer

video upload by akestromer

"This sequencer started as a Big Button Sequencer. When I looked into building a drum sequencer without internal sounds his was the only one that made sense. So I owe a great deal of gratitude to Look mum no computer. I've since learned a great deal and added and removed a lot of code, out of the about 800 lines of code there are still a few in there that come from him.

I used an atmega328p, some 74HC595s, a 74HC14 and some other stuff.
In this program the sequence currently running is in a 2d array of booleans. But to save space they're saved in the dynamic(?) memory (and the eeprom) as bytes. 2 per sequence. The 16 sequences are 16 steps long and each have 12 tracks.
I'll try to post a simple version of the code soon. It's kind of a mess.

"Sketch uses 8174 bytes (25%) of program storage space. Maximum is 32256 bytes. Global variables use 1125 bytes (54%) of dynamic memory, leaving 923 bytes for local variables. Maximum is 2048 bytes."

Anyway, I hope this helps someone."

https://reverb.com/shop/stromer-mutroniks

8 bit sample Drums with Arduino MIDI

video upload by akestromer

For sale at: https://reverb.com/shop/stromer-mutroniks

"These are modded Benz DXL6000 'Personal Digital Drums'

All the sounds in this video come from the two DXL6000's.
The MPC500 is just used as a MIDI sequencer.
One of the DXL6000's has the original sounds that came with the unit (snare, kick, tom1, tom2 & tom3) and the second one has eproms I made. Clap, Hihat and Claves.

Each unit has three 2764 eproms. The toms/claves just use one Eprom that's tuned differently depending on which sound is triggered. There are also three separate outputs apart from the master output. One for each eprom.

The machines are triggered with a simple arduino MIDI to trig circuit I made.
The MIDI channel and note for each sound can be changed by holding down the MIDI learn button at startup.

I think that's it. Complicated way to explain something simple.
Just watch the video, hope you like it. If you don't, do something else."

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Strömer Electric Bongos

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video upload by akestromer

"Based on the old Mica-sonic electric bongos. Sonic Electric Bongos made from the original schematic with added MIDI. Analog drums triggered by MIDI. Comes with a standard 9V power supply.
This one's for sale over here:"
https://reverb.com/shop/stromer-mutroniks

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