Doepfer R2M Midi-Ribbon-Controller - Manual (Page 24)

Page 24 R2M User's Guide V1.11
Fig. 8
In the R2M the parameter 3-4 PitchScale is used to adjust to conversion of the
position data from the position sensor into Midi pitch bend data so that they
correspond to the setting of the Midi receiver. It is recommended to set the pitch bend
range or scale in the Midi receiver to
± 5 octaves or to the maximum value if this is
not possible. Otherwise the R2M cannot be used over the full range of 5 octaves.
Then the pitch scale parameter of the R2M is adjusted so that best result is obtained.
Generating succeeding note messages with pitch bend
This mode is similar the preceding Trautonium mode. The parameter 2-1 Midi event
has to be set to Note&pitch bend absolute. The difference is that a new Midi note
on message is sent out as soon as the finger reaches a position that corresponds to
the next semitone. In the Trautonium mode no new note event is sent in this case,
only pitch bend data are used to increase/decrease the pitch.
This is how this mode works in detail: Touching the position sensor with the finger
generates a Midi note on message and the corresponding pitch control voltage CV1.
If the finger position does not correspond exactly to a semitone resp. Midi note
(normally this will be true) a "pitch bend correction" is send immediately after the note
message to shift the tone to the exact value. As the finger glides over the position
sensor without releasing the finger for the present pitch bend data are generated (so
far the same as the Trautonium mode). As soon as the finger reaches a position that
corresponds to another semitone a Midi note off message for the "old" note is
generated and the gate output turns off. After the retrigger time 4-3 the new note on
message is generated and the pitch bend starts with its neutral value. Simultaneously
the corresponding CV1 is generated and the gate output turns on.
The difference to the Trautonium mode is that a new note on message is generated
as soon as the finger reaches a position that corresponds to a new note and that the
pitch bend starts with it's neutral value. Another difference is that the initial Midi note
message is immediately corrected with a succeeding pitch bend message to obtain
the absolute tone with a much higher resolution as for the note message only. This is
why this event type is called Note&pitch bend absolute. Only in the very improbable
case that the finger position corresponds exactly to a Midi note number no pitch bend
correction would be sent when the finger touches the position sensor the first time.
Note event
Pitch bend - Pitch bend +
* ** *
a
b
c