Finished Pieces

Casio MT-240

    The picture below shows three status dials. These connect to standard 10 turn potentiometers and display the resistance value of the pot. They aren’t totally necessary, but they look pretty cool.

    Bending the MT240

    This is a great keyboard to bend because there are SO many possible bends and most of them are awesome. I usually make a patch bay where I connect all of the points shown in the picture below to a bunch of banana jacks.

    A patch bay system is great because it allows you to explore all of the potential connections over time. If you like having switches, just wire the leads of a toggle switch to two banana jacks then wire in your favorite connections for quick activation. It’s a good idea to label the rows and columns of patch points. Then you can keep track of the bends you find.

    I have found that LOTS of cool effects can be found by using potentiometers to limit the resistance between patch points. Use LOW value pots. 100 ohms are good. 10 turn 100ohm pots are great. The best configuration is a single turn 100ohm pot and a 10 turn 100ohm pot in series. They work as a coarse and fine tune and let you tweak the hell out of the effects you find.

    Linking 2 or more MT240s

    The clock speed of each keyboard is controlled with a crystal. You can sync the two keyboards by connecting them both to the same crystal. The pictures below show you how it’s done. This allows you to perfectly match the tempo of both keyboards and make some really rich overlapping rhythms.

    You may want to install a switch that reconnects the crystal in the “slave” keyboard. That way you can use it on it’s own or set it to “slave” when you use it with the “master” keyboard.


    25 Responses to “Casio MT-240”

    • 1

      princess dan said:
      April 1st, 2010 at 9:37pm #

      I love the Mt-210. Theres an overdrivey bend in it that’s more thrummy and leslieesque than the equivalent in the like-era casios I’ve been in. I’m talking about the bend that also makes the whole thing crazy loud. Plus, the casing is rokn. Would love to see what yours would look like.

    • 2

      A.S.M.O. said:
      April 2nd, 2010 at 4:06am #

      Nice job Peter, what do the 3 counters on the right do?
      I used a rotary switch matrix to dial in any combination of bends on mine, takes up less space than a patchbay.
      Will you be selling Drone Labs at the Bent Festival?
      See you there

    • 3

      BG said:
      April 9th, 2010 at 9:56am #

      I was trying to do something similar with LTC1799 precision oscillators and a bunch Korg DDD-1s. The problem is that the LTC1799 can’t handle too much load.

      I was thinking something like a breakout box featuring an LTC1799 into a high frequency distribution amplifier or splitter might be fun.

      A good way to override the internal clock crystal is to hook it up to a 1/4inch jack that gets interrupted when a cable is attached.

    • 4

      casper said:
      April 11th, 2010 at 12:14pm #

      @ASMO: The three counters are 10-turn 1K pots. The counter is just a fancy dial that tells you the setting. I AM selling drone labs at Bent and at a special Bent discount.

    • 5

      casper said:
      April 11th, 2010 at 12:16pm #

      @BG: I’ve been wanting to play with the LTC1799. Thanks for the tip about the load. I wonder if it would be hard to build a distribution amp that can handle the high frequency.

    • 6

      Not-BG said:
      April 11th, 2010 at 11:56pm #

      I’ve seen high frequency distribution amp chip that are rated up to 60mhz on Ebay, but I haven’t seen any designs for how to implement them.

      If someone figures out a way to do something like that or maybe have a multi out high frequency oscillator, they’d have my love.

    • 7

      cl said:
      May 4th, 2010 at 1:08pm #

      My oh, my! That is breath-taking. I would love to play that keyboard -would be nice to switch from virtual vst to something more physical and interactive.

    • 8

      Mutable Sound » Thunder, Lightning, Rodeo & Radio said:
      May 23rd, 2010 at 3:11am #

      […] Besides being a musician himself (Brinkman played with Chippendale in Mindflayer and has also played in Forcefield), Matt Brinkman is an artist and author of any number of comics as well, producing both anonymous and pseudonymous works. His Teratoid Heights comic was published by Highwater Books in 2001, and his performances have incorporated aspects of circuit bending and drum and bass, like his fellow Fort Thunder-ite, Peter Edwards. […]

    • 9

      princess dan said:
      May 24th, 2010 at 11:57am #

      How might one discern where the crystal is in a keyboard? Any more broad advice on the slave/master idea as applied to any keyboard? How did you detemine which trace to cut? Thank you zillions.

    • 10

      Sharon Rothman said:
      June 26th, 2010 at 12:47pm #

      I just purchased a Casio MT240 last night at an auction for my husband for $22. It appears to be in excellent condition and he has always wanted a keyboard so this is his new toy. I am curious to know what this would cost new, or did cost. I know we got a good buy.

    • 11

      CircuitBen said:
      July 9th, 2010 at 8:01pm #

      Just used this method to get my Sk-1 and Ct-395 tuned to the same pitch using the same clock (the clock in the sk-1). The speed of the beats on the Ct-395 are controlled by a separate oscillator, which can also be controlled via the LTC1799.

      Thanks for the info, whoda thought it’d be this simple? 🙂

    • 12

      casper said:
      August 7th, 2010 at 9:43pm #

      @ Sharon:
      I’m sure $22 is a good price. They were probably $80 or so new.

    • 13

      casper said:
      August 7th, 2010 at 9:52pm #

      @princess dan:
      You need to know what to look for. Crystals often look like capacitors with 3 legs or a square metal pillar.
      Read circuitBens comment above. He synced two different kinds of keyboards together using this method.
      I cut the lead that connected the output of the crystal to the board. I’m sure there was some experimentation involved.

    • 14

      alexis said:
      October 6th, 2010 at 10:51am #

      hey dude,
      i was wondering if you found the simple pitch bend for the keys.
      i suck and cant find it, any help would be great:)

    • 15

      Ke Art said:
      July 24th, 2011 at 5:21am #

      Fantastic! Thanks for all the modding tips. Kudos!

      Before I do any mucking about with my toys, I was wondering whether the two keyboard sync would work across a selection of casios if I haven’t got any doubles of a certain model; would I be able to sync up an MT480 with an MT18 or even an SA25?

      And would I be able to hook up more than two keyboards?

    • 16

      casper said:
      September 2nd, 2011 at 5:39pm #

      you can sync any keyboards that use a crystal as a master clock but it may not result in synced beats. It all depends on how the keyboard uses the master clock to set the tempo. One might use 1000 clock cycles per step while another may use 750 (for example). Try it out! And let me know what you find.

    • 17

      Tom Doty said:
      December 5th, 2011 at 2:40pm #

      I have a CASIO MT-240 that I use as a MIDI controller – works fine for me EXCEPT that the MT-240 has the quirky design feature of shutting itself off after a couple minutes if no keys are played. I find this totally aggravating! It even happens when an external power supply is used. How do I disable this battery-save feature so I can use the MIDI function when I am well into my songs?? I am well versed in circuitry and the soldering gun, etc… Show me in the schematic what trace to sever, where to solder, etc… whatever it takes to disable the time-out function and I will be very happy! I do NOT wish to “hit a key” every couple minutes to retain my settings. Thank you – Tom

    • 18

      casper said:
      December 5th, 2011 at 11:22pm #

      hmmmm. thats a good question tom. Unfortunately I dont have an answer. I’ve heard of people disabling this feature in other devices but not in the 240. The solution may be a real brute force approach of installing a timer and transistor which essentially hits a button every few minutes. its kind of a clunky approach but is a lot less of a hassle to implement than dealing with the auto shut down.

    • 19

      Mr. Grindley said:
      March 9th, 2012 at 11:23am #

      Casper, I was wondering about those 10-turn 1K counters. Despite several google searches I’ve been unable to locate these. Can I get some help finding them or something similar? Thanks.

    • 20

      JT said:
      March 14th, 2013 at 7:09pm #

      Have you tried syncing any other keyboards like this? I am considering connecting two SK-series keyboards (maybe two SK-8s? An SK-1 and an SK-8?) together, but still in the early early planning stages. Definitely doing some audio and midi cross-patching, but a clock sync would be incredible! Just thought I’d throw out a comment to see if you have anything to offer.

    • 21

      Chad said:
      April 13th, 2013 at 6:50pm #

      anyone know if the tempo from a clock out mod done to one of these keyboards would work with the clock in jack on a eurorack module?

    • 22

      Seb said:
      December 26th, 2013 at 2:02pm #

      Hello there ! Amazing work!
      I have a casio ct-370, which have great possibilities, the thing is that I would like to use patch bay and also found that using potentiometers to limit the resistance between patch points is amazing on this keyboard and I was thinking to put a 100 ohms potentiometer to each point ( so the way I see it on the paper it make 2 pot for one bend) but before purchasing all those pots, I would love an advice from the master on this. Thanks Casper.

    • 23

      Marqqo said:
      May 13th, 2014 at 5:02pm #

      Hello! I have MT240 without keys – was broken. Is there way to connect other keys from SA 21 to this device ??

    • 24

      Jim said:
      September 16th, 2015 at 2:41pm #

      To answer the question at #17 (above)… I found the following info for my Casio LK 42. Maybe this will help:

      Automatic shut off and power on alert.

      To defeat hold down the *TONE* button on power up. That will disable these functions. When these functions are turned off, the keyboard does not turn off automatically
      and no automatic light up key alert is performed no matter how long it is left with no operation being

      Auto Power Off and power on alert are enabled again when you manually turn off
      power and then turn it back on again.

    • 25

      Jim said:
      September 16th, 2015 at 2:44pm #

      PS: the above works for the following models:
      Casio LK 40, LK 42, LK 43, LK 44, LK 45 and LK 46. Probably others as well. Cheers!

    Leave a Reply

    If you're not already logged in, there might be a question you need to answer before you post to prove you're human. It's there to help stop comment spam.