XDigits.com

MIDI Auto-Accompaniment Systems

Jam partner (J.P.)

Jam partner was developed from RMCA Pro and is also MIDI software for Windows® 95/98/ME/ 2000/XP/Vista(TM)/ Windows®7/8/10 which offers all major features of a high quality MIDI keyboard and contains RMCA Pro' s chord progressions random generator. 

Click hereif you would like to see how to order Jam partner

Depending on various options it randomly chooses matching chords from specific chord groups or it mixes about 100 common chord progressions and generates via one mouse-click complete songs from any number of measures with variations and fills. This makes it an ideal jamming tool and helps to practice e.g. GUITAR or BASS in each key with a backing band and countless backing tracks, "composed on the fly". 

In this sense Jam partner is especially designed for users who are mainly interested in well structured background music and don't want to create their own styles or import MIDI files and derive chord sequences from them. Because of further differences of the programs RMCA Pro and Jam partner you may refer to the Features page.

In addition Jam partner comes with chord recognition, based auto arranger and editor, recording section, about 35 demo styles, up to 16 "fingered" and 10 "two-finger" chord types, MIDI-Export and much more. Songs can be recorded in real time, using the computer keyboard, a virtual keyboard, chord pads or an external MIDI controller, and can be reproduced with hundreds of free downloadable different RCS styles.

Jam partner also supports styles for YAMAHA® arranger keyboards.  Tens of thousands of those styles are available on internet for free download. - More ...

A little wizard will take the settings that are needed for various purposes. It can be opened any time by selecting "Help/Assistant" from the main menu.

  • In practice mode Jam partner automatically generates backing tracks, using randomly loaded styles. This makes it very easy to practice guitar or bass and be accompanied by a backing band with countless songs, because change of key and chord change are displayed a 3/4 measure before.


  • In playback mode Jam partner also generates tasteful tracks for practicing, movies or presentations in which the chord progressions random generator helps to get musical ideas.


  • In normal mode the user can actively make music on his own with his computer or a simple MIDI controller. Jam partner turns the MIDI controller or the computer into a full-featured MIDI arranger keyboard.

The DEMO version of Jam partner has no time limit and generally has all the functions of the registered version except for the saving capabilities, some special functions and the fact that only the about 35 included demo styles, several hundred downloadable so-called "1-part styles" and (- not with regard to MAAS -) styles for YAMAHA® arranger keyboards can be processed (but always only for a limited time).

Uninstall Jam partner

Jam partner does not need to be installed. The program also runs from USB sticks or flash drives and offers a switch which determines whether it is running in normal mode or in portable mode (Main menu -> Options -> Portable version).

Setup will NOT modify your computer configuration, but only creates 1 folder (...\RMCA) and 3 subfolders. If you would like to remove the application from your system, simply delete the program folder (...\RMCA) and its subfolders. That's all.

If you would like to learn more about randomly created
chord progressions and listen to audio medleys then


 Click here


Download Jam partner

Using the XDigits Download Manager for downloading and installing MIDI software 

By placing an order, you confirm that you have thoroughly tested the trial version of
Jam Partner (which can be downloaded here) and that it meets your expectations.