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MatchMaker CV In/Out Interface

CV Interface/Labeler


  • • CV Interface
  • • Labeler
  • • RIP Håkan Müller

Video clips

Håkan Müller, creator of the Hamu devices passed away in May 2018. He suffered from ALS for 3 years and finally decided to leave. To honor Håkan, you can use his Rack Extensions for free from now on. Please remember Håkan when you are inking your rack purple.

MatchMaker is a CV interface, where you organize and label your CV connections.

Do you ever reuse any block of CV devices working together? Instead of having to remember - or investigating - where the ins and outs are of such blocks, you should use MatchMaker. Connect all important signals to MatchMaker and make useful notes there. To frame your block of devices nicely, put an MxSpliger at the bottom too, and fold for ever all devices in between.

Rejoice! You've made your first very own CV module!

Product details

MatchMaker is both a labeler and a CV interface.

Interface between what? Well, wherever you feel a need to organize and connect separate sections of devices. The MatchMaker refers to External and Internal signals, but you may as well think in terms of 'above' and 'below'.

There are three rows of sockets in the rear panel, and the intention is to have each channel either as an input or an output of the module. In a 'template' module, the socket to connect to an external device is either the output, if this is not connected internally, or the external input when the out socket is connected internally. Then of course, the user labels should be utilized to support the understanding of each channel.

In addition to relaying CV signals between external and internal devices, MatchMaker has a level knob for each channel ranging from -2 to +2 times the input level. When there is no input cable connected to the channel, the output will be set to a fixed voltage equalling the knob level. With input cable attached, the channel knob affects both the internal and the external inputs, and if both are connected (not recommended, due to Mr Spock reasons) the input values are added.

From release 1.1.1 there is an additional thin, wide LED for each channel. This is dark when no cable is attached, shining green when there is an internal input to the channel, and yellow when only the output socket is connected. The purpose is to indicate to the module user if this channel is an output from the module (green), or an input to the module (yellow). In short: External cables should go to the socket with the same colour as the LED.

Since release 1.2.0 there is an additional Scale knob to the very right. With this knob in the default 1.00 maximum position, levels are just as with previous releases. When set lower, this scale factor will reduce the levels on all channels.

There is also since release 1.2.0 an Out Mode switch, which will affect the output level of channels which have no input connected: Switch off is default, and will give an output level according to the channel knob (and the global Scale). Switch on will turn off all such outputs (set to 0.00V) .

Notice that MatchMaker graphically fits as the top of the 'internal devices', with MxSplirger as the bottom. Copy an entire packet of devices to a new place/combinator/rack/song and you'll have all the required, expected and optional, thoroughly labled connections available all in one place.


  • 1.0.1 Original release
  • 1.1.1 In/out indicator LEDs added
  • 1.1.2 Bug fix
  • 1.2.0 Bug fixes for bad cable connections etc.
  • 1.2.0 Out Mode switch button added
  • 1.2.0 Scale knob added
  • discontinued



Released: 2014-10-03
Version: 1.2.0