For my oewn obscure reasons I would like to hear the murf patterns on my bassmurf and the bassmurf patterns on my murf.
I wonder is that possible by swapping a chip around, or would it need to go back to moog for reprogramming.
Has anyone done it?
F
I imagine that the difference between the MuRF and the Bass MuRF are the capacitors. Different sized capacitors cutoff different frequencies, like in a crossover circuit in a speaker. I don’t think it would be possible to get one to sound like the other unless you switched out the circuit boards. And what would the point of THAT be? 
I assumed they have the same patterns. Hmmm.
Maybe…although I’m assuming the MuRF patterns run just a hair quicker than the Bass MuRF patterns due to the lower frequencies of the 105B. I’ve been wrong before, and I may be wrong now, but that’s what my gut tells me. 
Hi
the murf and bass murf only have 4 patterns in common.
Some of you are mixing up the patterns with the frequencies. I think the patterns have no relationship to the frequency bands and that they are held in some kind of digital format. Probably on something like a ROM chip - no?
If I am right you could potentially stick any patterns in there and they should also be interchangeable between murf and bassmurf. At least that is my hope.
F
I was under the assumption that the 105 and 105B worked off S&H type circuits. It never occurred to me that there may be a ROM chip controlling the patterns. If this is the case, I’d find out if the ROM chips were either socketed or soldered directly on the board before attempting to switch them out.
its a chip alright - but surface mount,
from moog:
"Unfortunately the chip in question is the main processor, it’s a
surface-mount chip with 100 or so tiny legs and it would be supremely
difficult to swap them even for an experienced tech with all the right
tools. It is possible for us to re-program them here if you really want
to swap the patterns around, but it’s not something you can do at home.
If you are sure you want to do this, let me know and I can issue a
return authorization number for you to send them in.
Cheers,
Amos"
Too cool! Amos really goes above and beyond for us, doesn’t he? I wonder what it would cost for those to be swapped? Are you going to do it?
What would be even cooler, IMO, is if the patterns were freely editable. We have discussed this before; from memory we called it MIDI MuRF, or something.
I imagine this would work in a similar fashion to a “TR” drum grid i.e. for a certain MIDI channel, each filter would be triggered by a note-on message by a specific MIDI note number. The clock could be free-running, synced to a CV gate/clock/tap tempo, or to MIDI clock with a selectable clock divider.
It would then be nice to play around with looping grids in Ableton etc., and patterns could extend to whole songs or tunes with odd time signatures/phrasing. It would also impart a whole lot of flexibility and creativity to a unit which is sometimes limited in these ways. (Don’t get me wrong – I own and love both versions, but, you know… 
)
I don’t really see it happening, as the source code would need to be released and a front-end input interface designed. Oh well, one can always dream
Wow.
this makes my giddy 
did Amos sugest how much the service would cost,
and can we choose our own patterns, and submit them on a spreadsheet or in some format?
I definatly have a collection of patterns I might put on in place of a lot of them that I don’t use.
A customized MURF might be something 1 of a kind and unique that would later fetch a mint on ebay.
Oops well now that i put the idea out there probably not hahah!
I want it for me.. not for it’s resale value
I realize you can’t change the patterns with a lot of effort, but is it possible to trigger each of the filters on the MuRF with a Gate/Trigger pulse?
Are the filters on that chip too? I imagine that the chip sends out a 5V Logic TTL pulse to trigger each filter according to it’s stored pattern. If that were true, one could wire up trigger inputs for each filter and program my own patterns… But where do I soldier the wires to?
[quote=“Bryan B”]I realize you can’t change the patterns with a lot of effort, but is it possible to trigger each of the filters on the MuRF with a Gate/Trigger pulse?
You can use a foot pedal switch and the MuRF Pattern Step Adapter (http://www.moogmusic.com/moogerfooger/?section=product&product_id=213&back_id=117)
Thanks Brian. I do already know about that, but it is a great suggestion for a lot of MuRF owners to try any which way.
I have been using that feature since I bought it. It acts more like a clock in for an SH-101 or Juno-60 when you use the step advance feature. I use square wave LFO’s, trigger (or gate) signals from drum machines or midi converters to control it instead of the foot switch though.
I would like to take it to the next level and trigger each filter individually according to my own program. I just modded my TR-606 to have trigger/gate inputs (12 total!) for each sound and would like to do the same with this pedal some day.
I might get anxious, break it open and have my way with it at some point anyway. After you get over the fear of losing the gear, you realize how fun it is to tinker with it.