Module A-198 is a Trautonium Manual resp. Ribbon Controller. The controlling element of the A-198 is a linear position sensor (length about 50 cm) that has available a pressure sensor too.
Typical applications:
Trautonium manual, the string is replaced by the position sensor that is much easier to use and cheaper than the string.
In combination with the Subharmonic Oscillator A-113, the Trautonium Filter A-104 and some auxiliary modules a complete Trautonium replica may be realized. In combination with the Quantizer A-156 exact semitone intervals are possible.
Dimensions: Width (module): 8 HP / 40.3 mm Depth (module): 40 mm (measured from the rear side of the front panel) Current (module + manual): 40 mA Manual measures: about 600 x 30 x 18 mm !!! 3 Years Music Store Warranty !!!
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The A-198 is a well constructed and nicely expressive controller. It works great with a quantizer for lead lines, especially if you use the pressure to control vibrato depth. When using for control of filter cutoff etc. it is often good to pass the output through a slew limiter for smoother control.
Both the Doepfer A-198 module and the ribbon controller are decently build (As used from Doepfer).
It has a proper length "USB" cable for the Ribbon controller.
The Ribbon reacts as expected, simply to understand. I bought it for my Trautonium modules, but can also be used for other purposes.
With an attenuator, slew limiter or quantizer it gives you a lot more functionality and freedom to play the ribbon. But that is personal taste.
There is also will be an A-198-2 from Doepfer, which has midi in/out and a build in Quantizer, but is also more expensive. I didn't need these functions and the A-198 suits my needs.