Mod of the Day: Behringer RX1602

The BX1602 is a bang for the money, and its a very usable Line Mixer. Noise is OK for Live use, so i have a bunch of them (pretty much in every Rack).

Only drawback is, the Send is Pre Fader by default. As if someone would really have the need for a separate Monitor Mix from a Siderack…..

Luckily Uli Behringer is a clever guy, so its prepared to be modded to Post Fader simply by cutting a trace and solder a Bridge.

Heres how to do it – its an easy 15 Minute Job everybody can do. As long as you know where the hot side of a soldering Iron is….

If you dont know the difference between Pre and Post Fader Send this Mod is obviously not for you.

See here how to do it

I am not responsible for your Life, so do whatever you do on your own Risk!!



Little Dieter Kits available!

Ladies and Gentleman,

after a number of Little Dieters have been successfully built i assume the Instructions are OK.

So i can announce the availability of LittleDieter Kits, both in White and in Black.

Kits are 129€ + Shipping (mostly 17€ Worldwide) – if you want to order, drop me a line.

Modulation Fun!

8705602252_d332145c47_c2 RED LFOs and a Proto of the GREEN SEQ (here in black as the green Plexi didnt make it in time…)
all running TempoSynchron, the left LFO modulating PWM, the 2nd modulating Filter Cutoff, the Sequencer OSC Frequency (via a Quantizer).

You cant imagine how much fun it is just to step thru the LFO Waveforms and adjust the PhaseShift for the Filter Modulation……


Being a Modularist for almost 2 Months i refined all my LFO Modulation needs into my first EuroRack Modular Module: the RED LFO.

RED LFO small

It can perform the most common Modulation Tasks:

  • Ramp Up
  • Triangle
  • Ramp Down
  • Rect
  • Sine
  • S/H
  • Noise
  • Offset Voltage

All the Waveforms can be played with 8 Bit resolution and up to 15,5 Hz which is certainly not audio Rate but best what the PicAxe chip can deliver without aliasing. There are 3 interpolated Waveform inbetween the linear Waveforms from Ramp Up to Rect. Due to the limited CPU the LFO renders the Waveforms offline when selecting another – this means it will stop for a second oscillating indicated by lighting the Mode LED red.

All Waveforms play full ±10V and can be attenuated by the Level Pot, there are 2 Internal Trimmers for Range and Offset.

Nice extra and unique Feature is the ability to sync the Tempo of a RED LFO to another Master RED LFO via an internal Serial Link – simply turn the Frequency counter full CCW – the Mode LED will light up yellow and the Module will happily follow the Masters Tempo. You can shift the Phase of the Slave LFO with the Frequency Pot. If you want to leave Slave Mode turn the Frequency Pot full CW, the Mode LED will turn off and the LFO runs free. You may chain RED LFOs for as much Rackspace you have.

S/H Mode emits the typical Random S/H Signal, Noise produces some digital Noise and turning the Mode Pot full CW emits an Offset Value dertermined by the Frequency Pot, all these Modes with Yellow/Red indication from the Mode LED.

The needed +5V for the CPU is either generated by an internal PSU or can be taken from the +5V Rail of your Rack (and then left blank on the Board). The internal 5V Rail can even be routed to the Racks +5V Rail and serve as a +5V Adaptor for other Modules. Theres also Reverse Voltage Protection.

See here for some more Pictures

The RED LFO now will go into a Pioneers Run Stage with a limited number of selected Modularists testing. After this ill have PCBs produced and prepare Kits…. stay tuned.

How to start Modular – The Little Dieter

C’mon Guys (Ladies),
after doing some DIY Kits (Mutable Instruments best…), if you are honest, you shurely asked yourself why not get modular and build an monstrous Chinese Wall like Set of Modules you can sit in front of when BBC comes around makin a Bio about you lifetime achievement….


But where to start? And how not to spoil 1000s of Euros wrong in the beginning?

Thinking of all this i considered some alternatives and came to the conclusion that i had to start somewhere regarding the following

  • it must be a usable Setup right from the start
  • it must be good sounding and fun to use
  • its meant to be expanded and replaced but no single unit should be that crappy that it needs to be disposed
  • its got to be that cheap that i don’t mind replacing it sometime

This Set of features leads to the minimum need of one VCO, VCA, VCF, ADSR and LFO, a rack to mount all this and a PSU.
Adding this up with A-100 Modules from DOEPFER you’ll end up somewhere in the 500€ Area without a proper housing and MIDI Interface.

Taking a deeper look, theres the DOEPFER DIY Synth, delivered as a bare built PCB that you have to wire yourselves, including a VCO, VCA, VCF, LFO, Inverter, Buffer, Slew Limiter – hey, thats just what we defined above!!! And this for a whooping 120€! Perfect to start into Modular, all whats left was to design an EuroRack compatible Panel and i am ready to go, so heres my first Prototype, Codename LittleDieter™:


While being far from perfect you can see where its leading to:

  • jacks are spatially correlated to the Pots so its easy to patch
  • jacks are coded with a Triangle (Audio), Dot (CV) or Squre (Gate) that are located at 11o’clock for the Inputs and 5o’clock for the Outputs
  • nothing is prewired although the used jacks are switching type and you could prewire your favorite setup
  • only common pots and easy to source jacks are used
  • the panel (42TE) is made of a 1,6mm piece of 2PlyAcryl glued to a 3mm backpanel
  • on the back a 2nd panel is attached by 20mm spacers on which the DOEFPFER DIY-Synth PCB is attached

This shurely isn’t the Ferrari of modular Synthesis but as stated above I’m aiming more for the DACIA 😉

While i am wiring the whole mess here a bit of Gearporn:





EDIT: Just spotted: Dieter and I both have the same scope! And the past is strictly black and white.