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Posts posted by electronicpresskit
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sweet! thanks!
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I tested it a bit more and it seems any progression that is above 1:0 has this problem. I understand how this would be tricky to fix, and it is not going to keep me from using the machine, but it seems quite a big limitation to only be able to use the progression feature on 16 steps.
All my patterns default to 32 steps so I expect all 32 steps to be played through when I adjust the progression. I love this feature, but I would probably not be able to use it live because I would have to think about which section I am on when I adjust the progression, and it is more difficult to predict the outcome, so more dangerous for performance. Too many variables to track.
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I think I found a bug...with pattern length set to 32 if I change progression to fwd: 2 back: 3, only the steps 17-32 on will be played back. strangely enough if I set the progression to fwd: 2 back: 1 only steps 1-16 are played back and then of course if I set it to fwd: 1 back: 0 is plays normally.
Does this happen for other people?
Thanks!
epk
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cool schematic! although I haven't yet been able to understand exactly how it's accomplishing the limiting.
I ended up using two inverting opamps to do the summing, then adding a 1N4148 reverse polarity after the first opamp to limit it's output to negative voltages, then added a 4.7v zener diode (reverse polarity) on the output of the 2nd stage to limit the range to 4.7v and this seems to be working.
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I'm still pretty new to working directly with PIC's and microcontrollers in general, so this is good info to know! Now I get to learn how to limit an opamp's output voltage!
Thanks!
epk
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So I'm planning to add CV control of the Swing amount on my MB-808 by simply adding a summing stage after the Swing pot. I'm wondering about how well the core will handle >+5v at the input though. Will it be ok if it gets hit with +10v or do I need to limit the output of my summing stage to 5v?
Thanks!
epk
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First off, thanks to TK! Sequencing the MB-808 is great!
I have two feature requests with the second being most fun:
Feature #1: Tempo Fine Control
hold down shift while adjusting the tempo encoder to get sub 1 bpm adjustments. I'm not sure what the right resolution would be, maybe .05 bpm per encoder click?
Feature #2: Momentary Tempo Adjust
hold down alt while adjusting the tempo encoder to make temporary tempo adjustments that snap back to the predefined tempo on release of alt. I think maybe .33 or .5 bpm per encoder click would be a good resolution? This provides a way to beat match similar to how DJ's push and pull the platter on a turntable.
I added these features to the software sequencer I make and it's really a lot of fun! It makes it easy to forget about midi beat clock and just go drop in on a friends DJ set or whatever. I'd love to have this on my MB-808! :)
MIDIbox 808 Firmware
in MIDIbox SEQ
Posted
unfortunately I didn't have access to a midi interface to test this until recently, but I've got it uploaded and now experiencing another bug...
if I set loop length >16 && <32, only steps 17-32 are played.
So as an example, set loop length to 26 and hit play. Note that steps 17-32 are looped. Set the loop length to 32, and steps 1-32 are normally looped.
this is with standard 1:0 progression.
anyone else have this?