This manual shows how to install uniPulse in the ELKA Drummer One and thus allows to trigger voices via midi and to sync the Drummer One to midi Clock.

Thank you very much to Thomas Kayser of SynthMedic for figuring this out and providing pictures.

After installation use the Config Tool to upload the Config file for ELKA Drummer One (right click, save as).

Connecting trigger points

Below you can see the installed uniPulse. Trigger points are on the right the picture below shows the trigger points in a bit more detail. Two of the triggers needed additional 1Meg resistors to ground which can also be seen in the picture. UniPulse channels 1-9 are used.

Midi Clock Sync

If you like, you can also sync the Drummer One to midi clock. This requires a bit of additional circuitry. A two-pole switch is used to switch between internal and midi clock. This switch is provided with the uniPulse kit since uniPulse MK2. You will also need two general purpose NPN Transistors and 2x10k and 2×2.7k resistors. The circuit can be seen below. Its purpose is to level shift the clock and gate voltages.

The GATE signal is connected to uniPulse pin D1, the CLOCK signal to uniPulse pin D2.
The picture below shows the location of the C point and the circuit on a prefboard. To access points A and B, one leg of a capacitor needs to be desoldered. This is also shown in the picture below and in more detail in the next picture.

Installing the uniPulse board

You can mount the uniPulse board in the case using distancers as shown here:

The Drummer One needs to be in start mode with all Rhythms deselected in order to be synced to midi.

A customer sent us the uniPulse trigger points for the Roland TR-66. Thank you very much! Installing is very simple, just connect the unipulse to the trigger points as shown and upload the config file via the tool.

As you can see there are 9 instruments you can trigger:

BD = Bassdrum
SD = Snare Drum
HH = Hihat
CY = Cymbal
HC = High Conga
LB = Low Bongo
HB = High Bongo
C = Conga
RS = Rim Shot / Cow Bell

Just connect uniPulse outputs P1 .. P9 to these points, configure these outputs using the configurator as ’15V, negative, Open Rect’ and you are good to go.

When the bossanova rhythm is selected, you will hear the Rim Shot. If no rhythm is selected, the cowbell will sound.

uniPulse needs some Power and you can get it by connecting uniPulse GND to G1 or G2, and connect uniPulse V+ to B0 of the voice board as shown in the next picture.

Have fun!

This manual describes how to install uniPulse in a Boss DR-110. If gives you velocity sensitive trigger of the instruments, accent trigger and midi clock sync.

There are two additional sounds that can be triggered via midi: Part of the clap (electric snare) and part of the cymbal.

For the DR-110 you need to get the custom DR-110 uniPulse version.

Installing the kit does not require to cut any traces and is generally a simple soldering job. You do however need to drill a hole for the MIDI socket. We use a 3.5mm jack socket and include an adapter. If you require, you can also install a DIN-socket, but it only barely fits. You also need to install 2 additional switches: One switch to select the clock source (MIDI or internal). The other to switch the bassdrum trigger from MIDI to internal.

MIDI is received on channel 10 with the following notes:

Installation manual as PDF

This schematic shows trigger points and clock injection points for EKO Rhythm Maker to be used with uniPulse.

To our knowledge this has not been tested yet, if you have, please let us know.

Continue reading →