seku sequencer still in progress

YouTube via lesingemonotone | December 14, 2010 |

"2 channel cv/gate sequencer based on manu seku sequencer.
This is a test of channel 1 containing separate cv and gate channels with potential of separate clocks, lengths."

Sequencer - Seku

The Seku by Mauno Tuominen (http://www.studiomanus.com/seku.htm)."

"Heart of SEKU is CMOS 4520 dual synchronous divide-by-16 counter. RESET-in-jack must be normalised to ground when not used (16-step mode). Length of the sequence can be set to N by patching PULSE OUT from N+1 step to RESET IN jack. When no clock is connected to CLK IN sequencer can be manually stepped from STEP button.

CMOS 4067 1-of-16 analog switch is used for GATE, CV and PULSE outputs. Inhibit-pin of GATE OUT 4067-switch is clocked at the same frequency as the 4520 with 4001 nor-gate turning each GATE OUT off before turning the next GATE on. You can mute any one of the 1-16 steps with the STEP MUTE switch."


video upload by sigmambient

"Self made analog step sequencer controls Korg MS10 and Roland S100M synthesizers. First row controls MS10 pitch and S100M noise-drum gate. Second row controls MS10 filter-cutoff.
Synthesizer sounds are modified live when sequence is running. More information about SEKU and Sigma on www.studiomanus.com"

You might remember the SEKU from these posts (scroll).

seku sequencer in progress

YouTube via lesingemonotone
"Testing out the basic components in my seku sequencer building project.
Clock and reset is driven by ht/lt trigs of the 606 and the CVed oscillator, filter and springreverb are the Paia 4700."

SEQU Sequencer

via zthee on this electro-music.com thread where you can find more.

"It's a sequencer based on the Seku by Mauno Tuominen (link).

The whole thing started of as an idea to build a simple gate sequencer using only CMOS. I thought that by using just 2 4017 and some logic I could get it all to work. But after some trial and error - that just resulted in failure. I gave it up.. (The basic problem was that I never got it to reset at the right step. It was either to early or to late..) ..and decided to build the Seku instead.

I'm not sure I'm gonna get it all to work. But the LEDs light up fine (except for LED 6 and 16 which I have the wrong way around..). I'm gonna try the CV portion out tomorrow, and I hope I'm able to finish the gates aswell."

SEKU Analog Sequencer

YouTube via sigmambient.
"Self made analog step sequencer controls Korg MS10 and Roland S100M synthesizers. First row controls MS10 pitch and S100M noise-drum gate. Second row controls MS10 filter-cutoff. Synthesizer sounds are modified live when sequence is running. More information about SEKU and Sigma on www.studiomanus.com"

SEKU Analog Sequencer

Title link takes you to a couple of shots. Via Sigma:

"We are an Ambient/Electronic-music duo from Finland and have something we would like to share other synth/DIY-fans.

SEKU is a self made 2 x 16 step sequencer with slider-pots as in ARP-sequencer. Length of the sequence can be set to N by patching PULSE-OUT from N+1 step to RESET-IN jack. When no clock is connected to CLK-IN sequencer can be manually stepped from STEP button.

Each row has CLK-IN, CV-OUT, GATE-OUT and RESET-IN jacks. You can mute any one of the 1-16 steps with the STEP-MUTE switch. Each step has also a PULSE-OUT jack.

Slider potentiometers for STEP-CV adjusting are used because they are more informative.It is also possible to draw waveforms with the sliders when SEKU is clocked with audio-rate clock.

SEKU and Korg MS10 combination is something very special. When you patch first row CV-OUT to Korg VCO-CV-IN and second row CV-OUT to Korg CUTOFF-FREQ-IN (modulation wheel is patched to INITIAL-GAIN-IN so that VCA is open) you always get something very musical.

Here is YouTube-link for video-demo of SEKU-MS10 combination with additional noise-drum from Roland S100M: link

Our new CD "Music With Analog Improvised Soundscapes" is based on this SEKU-MS10 combination and can be purchased from CD-Baby: link"