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Zeus Commander SPS 16, DIY MIDI Step & Pattern Sequencer

Zeus Commander SPS 16, DIY MIDI Step & Pattern Sequencer
« on: January 26, 2019, 11:05:50 AM »
A little video demonstrating a Teensy based step & pattern sequencer I designed and build:


https://www.youtube.com/watch?v=IH-grgRmClY

Details are in the thread over at the Teensy forum: https://forum.pjrc.com/threads/54995-Zeus-Commander-SPS-16-MIDI-step-amp-pattern-sequencer

In short:
- 6 parameters per step controllable by motor fader: Pitch, velocity, note length, timing and two assignable MIDI controllers
- 16 steps per pattern
- 2 groups of 4 channels
- 64 programs


Pattern properties are:
- Length, number fo steps (1-16)
- Repeat, number of times pattern is repeated in chains
- Next, pattern to follow after last repeat
- Tempo, tempo division (16 options in list)




BTW, a Prophet 6 provides the 'plonk'.

Re: Zeus Commander SPS 16, DIY MIDI Step & Pattern Sequencer
« Reply #1 on: January 26, 2019, 12:49:28 PM »
A little video demonstrating a Teensy based step & pattern sequencer I designed and build:


https://www.youtube.com/watch?v=IH-grgRmClY

Details are in the thread over at the Teensy forum: https://forum.pjrc.com/threads/54995-Zeus-Commander-SPS-16-MIDI-step-amp-pattern-sequencer

In short:
- 6 parameters per step controllable by motor fader: Pitch, velocity, note length, timing and two assignable MIDI controllers
- 16 steps per pattern
- 2 groups of 4 channels
- 64 programs


Pattern properties are:
- Length, number fo steps (1-16)
- Repeat, number of times pattern is repeated in chains
- Next, pattern to follow after last repeat
- Tempo, tempo division (16 options in list)




BTW, a Prophet 6 provides the 'plonk'.

This is absolutely fantastic! Can the patterns be chained together for song mode?
Prophet 6, Prophet X, Moog Sub 37, Oberheim SEM-Pro, Tempest Drum Computer, Roland V Piano,Kurzweil K2600XS, Roland FA-08, Baldwin Upright Piano, Fender Stratocaster, Fender Telecaster, Gibson Chet Atkins SST, Jackson King V, Ibanez Jem, Roger Linn Adrenalinn iii

Re: Zeus Commander SPS 16, DIY MIDI Step & Pattern Sequencer
« Reply #2 on: January 26, 2019, 01:23:33 PM »

This is absolutely fantastic! Can the patterns be chained together for song mode?

Thanks  :)
Yes, patterns can be chained although there is the restriction that a pattern can only appear once in a chain although it can be repeated up to 16 times. In the video I copy pattern 1 of the bass line to pattern two, modify it a little, and then tap in a sequence: 1-1-1-2. This creates a chain that wil repeat: three times pattern 1 then pattern two and back to pattern one. Chains are essentially created by defining the next (following) pattern for a pattern. The idea is to allow the creation small (1-4 patterns) chains and switch between these on the fly when the sequencer is running. It is of course also possible to chain all 16 patterns.
Not shown in the video is the ability to set different tempo divisions (0.5 0.75 1 1/2 1/3 1/Pi 1/4 1/5 etc.) per pattern. The timing should have millisecond precision. The tempo is calculated as a floating point value, note length can be varied between 5% and 100% (legato if following pitch is the same) of the step length, the note on event can be shifted around the 'grid' by -50% to +50% of the step length.
The goal was to have real hands on control over the step parameters themselves and to create a tool for improvisation. An instrument to play with, not a recording device.

Re: Zeus Commander SPS 16, DIY MIDI Step & Pattern Sequencer
« Reply #3 on: January 28, 2019, 03:52:58 AM »
Strumming notes on an OB-6 by shifting the timing, assigning and using MIDI controllers.


https://www.youtube.com/watch?v=DpMmWzhwDyM

There's a list of predefined controllers to choose from, the definitions contain not only the controller number but also the range (important for NRPN) and MIDI channel.