Mobius – Working Prototype

I just finished the first prototype of the Mobius, and it works like a charm! Photos and videos to come.

In a nutshell, here are the features of release One (more details below):
  • 8 True-Bypass loops with silent switching action.
  • 2 independent groups of loops + modular design.
  • 32 banks of 4 presets each.
  • MIDI Input & Ouput.
  • LCD display, for naming banks and presets.
  • Live mode.
Okay, so now, how does it work?
This is simple: when you have a lot of stompboxes, and want to switch from a sound to another, it sometimes involves a lot of stomping. These actions can get you out of rhythm, and you might want to keep your attention on your playing, not on your feet.
The Mobius is a helper, it switches automatically your effects for you, when you kick only one footswitch.
What does modular means?
We saw previously that the Mobius has two independent groups of loops. Two inputs and two outputs. You can use this to put some pedals before your amplifier, and the others in the FX loop. as the two groups are totally isolated, there will be no grounding problem. Most commercial loopers have a fixed configuration, but here you can choose how many pedals you want in each group. The Mobius adapts itself to your rig.
What about MIDI?
With the MIDI input, you can remotely control the Mobius from an existing MIDI foot controller. As the chassis is rack-friendly, you can even mount it and switch between your racked stompboxes and effect processors.
With the MIDI output, you can change presets of your MIDI-capable effects while kicking them in the loop. (up to 5 MIDI messages can be sent per preset). The MIDI output also acts as soft-Thru.
What is the Live mode?
Presets are cool when you play a song in a band, when everything should be under control, but what if you want to go off the path for a jam? In the Live mode, each footswitch (including Bank Up and Down) is associated with a set of loops, that you can add or remove from your sound.
For example, you can assign your favorite distorsion to switch A, your chorus to B, both delay and reverb to C, ect..


I am working on porting the blog to WordPress, for a few reasons:

  • More customizable
  • Prettier
  • Easier to use
  • Can preview before posting

So long Blogger, it was really nice for the start.. Time to move on!

MCO – Portamento and Hard Sync

I am working on the analog part of the MCO, basically Saw wave generation. The main idea here is to keep it simple not to charge the Bill of Materials too much, but keeping a high quality analog waveform on the output. As a matter of fact, all the waveform generation (Pulse, Triangle, Sine) is located outside the MCO Core, which outputs only a Saw wave.

In the mean time, I found interesting to add the Portamento capability to the heart of the oscillator, as well as synchronisation (so far Hard sync, soft sync could be obtained with only one capacitor added).

MCO – Samples

Finally, here are some samples of the MCO in action.

Digital sweep: the MIDI notes (from 0 to 127) played sequentially.
Audio sample: mp3 – 688 kB or wav – 7.7 MB


Analog sweep: the modulation input is fed with a ramp wave (-4 to +4 volts), allowing a sweep over 8 octaves. The modulation range is actually higher that 8 octaves.
Audio sample: mp3 – 1 MB or wav – 12.2 MB
Spectrum and pitch
These pictures were plotted using free software Audacity.