lacuna vrm

Posted on Feb 5, 2014

I bought a Doepfer LMK3+ keyboard from a very pleasant chap in Dunedin, via TradeMe, a popular New Zealand auction site. The keyboard features a nice, piano-like Fatar keybed in a rugged flight case. Here`s a photo of another LMK3+, taken from a recent auction on German eBay : I didn`t pay very much for mine, because it was missing the MIDI interface. The previous owner

lacuna vrm
Click here to download the full size of the above Circuit.

liked the knobs and wheels so much that, after changing to a different keyboard, he had the interface removed and placed in a stand-alone box. So, the end of mine looks like this: Also, the flight case is devoid of labels, so I have no way of confirming that it`s actually an LMK3+ (with the uprated keybed) rather than an original model LMK3. I have emailed Doepfer, and they told me that they stopped producing the LMK3+ in 1993 and that they have no suitable parts for it. Consequently, it looks like I will need to build my own interface to the keybed. (I`m assuming that if the previous owner was prepared to part with the interface, he would`ve put it back in the keyboard and sold it as a complete working unit for a lot more money. ) After taking the keybed out of the flight case and cleaning it up, I was able to find the label with (I assume) the serial number and the date of construction ("montaggio" apparently means "assembly"): I was hoping to find a part number that I could use in my quest for technical specifications on the keybed interface, but I haven`t seen anything like that. I can see how the switching for the keys works: when a key is pressed, a piece of wire breaks a contact with one jumper and then makes contact with a second jumper. (This is hidden behind the leftmost aftertouch sensor in the photo above. ) The timing between the break and the make gives you the key velocity. What I don`t know is how the 88 key...

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