Get LoFi Circuit Bending Blog

Circuit Bending and Synth building blog for beginners and pros alike. Featuring Circuit Bending resources that include: Tips, images, audio, and video. The lowdown on my new instruments, Glitch art, Minimalist ideas, electronic music, etc.

Tuesday, December 06, 2005

Alesis ModFx SmashUp part 1

Alesis ModFx units have been at clearance prices for quite sometime. I did get my Philtre and SmashUp relatively cheap a while ago. The Philtre is kind of cool, but the Smashup totally sucks IMO and here is the reason why. It puts that annoying compressor pop all over my tracks and I am sick and tired of it. Now I don't expect a lesson on compressors and how I should use them, but for the longest time I wanted to take apart the darn thing and see what's on the insides. The hardest part about that is undoing the nuts that are on the control pots, I used a pair of needle nose pliers to do the trick. To no surprise at all the main DSP consisted of a tiny tiny Chip. The main IC had an Alesis 0-61-0060 m14 v1.04 sticker on it, under the sticker the true identity of Phillips p87c51rd-1b was revealed, link to datasheet here. Its a programmable sucker and I have not had much time to look through the specs, but my guess is that all of the ModFxs are virtually identical except with different firmware. I still have the Philtre to disassemble and confirm that. I guess the next step is to probe around and see if I can fry the thing. One thing I gathered from the datasheet is that these chips have an onboard crystal, however there is a second clock input that can be manipulated. So the usual data injecting techniques will be tried. Please stay tuned for part 2........

5 Comments:

  • At 12/06/2005 05:32:36 PM, Keith Seaman said…

    I tried picking up the Philtre when it was 40 bucks and they were out, then I tried the metavox and they were sold out on those too, musicians friend.. just my luck. good luck with the bends.

    keith.

    ps: didn't intend for a scuba diving pun there.

     
  • At 12/10/2005 12:05:35 PM, Eric.Bar said…

    I have the Bitrman, It gives a gr8 sound, but I`ll be happy 2 MoD his brains out :)
    Looking forward to part 2...and 3...

     
  • At 12/11/2005 04:26:42 AM, Anonymous said…

    I concur with your statement that these are all basically the same with different firmware... they are basically identical inside. Good luck on your ventures to bending this... I will certainly keep tuned. I have not tried because of the chance of blowing something up, but I guess I Use my faze so little I may as well.

    Oh, and thanks for the link to the expression pedal mod.

    -Colin
    http://www.experimentalistsanonymous.com

     
  • At 2/27/2006 12:20:54 PM, Anonymous said…

    If they all have the same hard but different software, do think it would be possible to download the software from one into the other?

    I have a phazer and don't care for it. I would like a Bitrman or a Metavox.

    Joe

     
  • At 3/29/2006 01:33:13 AM, Andrew said…

    I have both the faze and phlngr, I too opened them up and found that they have exactly the same circuitry. I’ve found a bunch of info on the DSP, DAC/ADC, and Controller, but almost none on the modfx system it’s self. Here is the info I’ve collected:
    The DSP is AL3102 with AL1101 (Analog-to-Digital) and AL1201 (Digital-to-Analog) on one each side both by wavefront (aka alesis semiconductor)
    http://www.wavefrontsemi.com
    these chips are on the lower board.
    There is some interesting development with AL3102’s sister chip AL3101
    http://www.axoris.be
    http://bkasm.sourceforge.net/

    The thing I found interesting is that the 9 pin modlink passes the digital right off of the DSP chip. I have a ruff pin out:

    MALE (Input)
    1 nc
    2 goes to board B/
    3 pin 4 on 3102 in0
    4 pin 6 on 3102 clock
    5 nc
    6,7,8,9 GND

    FEMALE (output)
    1 nc
    2 jumped to gnd
    3 pin 7 on 3102 out1
    4 pin 8 on 3102 out0 (clock)
    5 nc
    6,7,8,9 GND

    There are a few mods I was thinking of with just the db9 connector, like passing power over pin 1 or 5. Also wavefront sells a reverb chip (AL3201) for around $10 that could be placed between two modfx boxes.

    Unfortunately my knowledge base is limited and other then my PC I haven’t dealt with any CMOS/flash programming. Though to me it seems like it’d be possible to dump the firmware from each box and then be able to flash it onto another box or even make new programs.

    There are a lot of options before bending as even started.


    .Andrew

    awnordma [at] mtu [dot] edu

     

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