I have six or seven Eurorack cases, of all different sizes. The largest is a 9U, 104 hp case that stays in the studio most of the time. Then I have a 6U, 90 hp case that is also used mostly in the studio. I have two that are put together as stand-alone instruments, one for Mocante and one for Folktek Mescaline. The smallest are a 4ms Pod 64 and a Pittsburgh Modular Cell 48. Rather than try to populate the small cases as instruments, I am trying out using them as auxiliary cases, each with a special focus. The idea is to patch them together with either of the two studio cases, as desired.

I always install a black banana jack on each Eurorack case, wiring it with 18 gauge wire to the common terminal (ground) of the internal power supply. When patching between cases, I use a Pomona banana patch cord to connect all the commons.

I wrote about the Pod 64 Modulators case recently. That one has a bunch of LFOs and Sample & Holds, plus other functions to be used mainly for control voltage generation and processing. Now, I’ve specially purposed the 48 hp Cell 90.

Dividers, Logic, and Switches

The module list:

• 4ms Company Rotating Clock Divider
• AniModule Syncopated Timing Disruptor
• Klavis Logica Gater
• Klavis Logica XT
• Softwire Synthesis Octal VC Switch
• Olegtron Confusor 2 Switch

I’ve conveniently co-located two different kinds of pulse divider (the STD can also multiply, as well as provide tap tempo), two logic modules, and two very different switches.

Now, instead of trying to jam dividers, logic, and switches into my studio cases, I’ve made it outboard to use with either of them, leaving space in the larger cases for more audio, CV and FX modules.

Upgraded +5 volts

The power supply in this case is a Pittsburgh Modular DC Cell unit, which uses a 3-terminal 7812 type regulator for +12, a 7805 for +5, and DC-DC converter for -12V. A while back the 5 volt regulator malfunctioned for an unknown reason and I removed the 7805 chip. Rather than replacing that, I decided to use a Klavis NoDrain. It draws from the -12V rail to produce +5V. Since this module set uses very little current to begin with (+12V 137ma, -12V 53ma, +5V 47ma), there will be nowhere near the current rating of the supply used. I chose the NoDrain mainly for reliability.