Module #3 - XR-VCO - Sync+linear FM

YouTube via Gameboygenius | January 23, 2011 |

"The XR-VCO has a nice hard sync. Add to that some FM, and you're ready for phatness."

Module #3 - XR-VCO - Cross-modulations

Gameboygenius | January 23, 2011 |

"In which I try various cross-modulations between the Oakley VC-LFO and my new XR-VCO."

http://www.youtube.com/user/Gameboygenius

Info about the monotribe MIDI modification (also some raocow)

YouTube Uploaded by Gameboygenius on Aug 14, 2011

"Lots of infoz: http://blog.gg8.se/wordpress/2011/08/14/monotribe-midi-and-me/

The photos in this video: http://www.flickr.com/photos/gameboygenius/sets/72157627291262639/with/603469...

Discussion on the Muff Wiggler forums: http://muffwiggler.com/forum/viewtopic.php?t=39099&postdays=0&postord...

Music sequenced in Renoise, played back on Korg monotribe and fed back inte Renoise's effects. The drums are not played by the monotribe, but are samples in Renoise."

Jam at EMS modular meetup 2011-03-03

YouTube Uploaded by Gameboygenius on Mar 3, 2011

"x0xb0x vs my modular so far. What's mainly going in this video:
1) XR-VCO being controlled by x0xb0x's control voltage.
2) x0xb0x 's main out used as linear CV on XR-VCO.
plus of course a bunch of other random patching and wiggling."

Module #4 - Magnus Danielson sawtooth phase shifter

YouTube via Gameboygenius | January 29, 2011 |

"(Bad) schematic and theory of operation: http://home.swipnet.se/cfmd/synths/sc...

The original sawtooth frequency doubler ("octave shifter") works by "cutting the sawtooth in two", to double its frequency. The phase shifter lets you modulate where the wave is "cut", in other words, it allows to shift the phase of the wave. Instant fattification!
Of course, this module can be abused, just like any other module."

Heebie-GBs - World's First LSDj Album Sold on Cartridge

Hands on with the Heebie-GBs Gameboy cartridge album

Published on Nov 19, 2014 Gameboygenius

"Cartridges are still available from ASM Retro: http://asmretro.com/hbgbs

A Halloween 2014 compilation album as a Gameboy ROM. The world first LSDj album sold on cartridge.

Menu code and LSDj adaption by nitro2k01. Spaghetti code by a pastafarian. Powered by LSDj by Johan Kotliniski.

Track list:
Nordloef - Cradle to the Rave
Aaron Ishibashi - Freaky Fugue
Solarbear - Pornogoblin
Tommy Creep - The Width
Pixelherozero . Thrashold
Vegas Diamond - Skulljam
Matthew Jospeh Payne - Zoinks!

Video recorded with BGB. Further edited with avisynth and Sony Vegas Pro.

Halloween? Easter? What's the difference? You can get eggs any time of the year."

Who needs an Atari module... (Harsh)

YouTube Uploaded by Gameboygenius on Mar 11, 2011

"... when you can do crazy shit with cross-FM and a comparator!

Sorry (or happy) for the harsh sound. The crappy microphones on the camera doesn't exactly make it less harsh. ;)"

Monotribe has MIDI out hidden inside

YouTube Uploaded by Gameboygenius on Aug 3, 2011

"Someone suggested the "serial" connector on the Korg monotribe might spit out MIDI signals. That person was right!

Discussion on Muff Wiggler forums: http://www.muffwiggler.com/forum/viewtopic.php?p=531711#531711"

via nitro2k01:

"CONFIRMED! It is actually spitting out proper MIDI on the serial line! It gives you the following:

Note data.
MIDI sync, incl. start and stop messages.
Automation data for all of the LFO settings (both the knobs and the switches) and the EG shape. This suggests that the LFO and envelope may be created in software.

I have not yet hooked up an optocoupler and fed the thing MIDI from the other end, but I will. Shorting the serial out and serial in ports glitches the thing, so it most probably is capable of receiving MIDI.

Here's the pinout for the pin connector marked serial on the board.
Code:
CN12 MCU
1 Pin 20 PH0, TB0IN0, /BOOT
2 Pin 12 RXD0
3 Pin 11 TXD0
4 Pin 9 Vdd (3 V)
5 Gnd
6 Pin 29 PF6/SCK1

I believe this header was intended for factory programming of the firmware. When pin 1 is held low, the MCU enter a special programming mode, according to the datasheet. Pin 6 goes is routed up to somwhere near the power switch and is probably used to detect when a unit is turned on to begin the programming.

CN13 (which comes with no connector attached) would be used for debugging, but it is likely that debugging is disabled so you can't dump the firmware etc. Still haven't looked into that. (I don't have JTAG tools readily available, so...)

But what we're interested in is pins 2-5. Pin 2 is for receiving MIDI. Pin 3 is where MIDI comes out. If you're going to try to add an optocoupler, you'll also need Gnd and Vdd.

MIDI is a current loop protocol, so 3.3 V is no problem for standard MIDI gear given that you adjust the output resistors accordingly. Following the standard MIDI convention, I connected 3.3V and the output as usual, but replaced the usual 220 ohm resistors with 150 ohm ones. Works well enough.

I also got an idea: If the monotribe can receive MIDI, that may open up the possibility of throwing the internal oscillator out the window and using the it as a self-tuning MIDI CV interface for modulars. However, I've found that at least my monotribe tracks badly and sometimes drifts a little. This is especially obvious when comparing it to a well-tuned computer playing the same MIDI notes. Also, it's using just 5V internally for the analogue part (3.3V for the digital) and the CV range may be even less, so perhaps it wouldnn't be of much use for 1 V/oct systems.

More to come..."

Two ways of using the hidden MIDI in functonality on monotribe

YouTube Uploaded by Gameboygenius on Aug 5, 2011

"Two ways:
1) As a TB-ish synth.
2) Creating instruments on the fly by sending new automation data for each new note.

Discussion on Muff Wiggler Forums: http://muffwiggler.com/forum/viewtopic.php?t=39099&start=0

Another monotribe modder: http://monomodder.blogspot.com/"