Upper/Lower Swap; Wheel Volume Map; Organ Map; Lower Transpose / Upper Transpose - Kurzweil K2661 Musician's Manual

Program Mode and the Program Editor
The TONEWL Page
emulations. This would leave you eight voices for other programs. You can specify up to 95 tone
wheels.
Here's how to do the math to calculate polyphony: the number of K2500 voices used by a KB3
program is (number of tone wheels+1)/2, rounded to the next highest whole number if the
result is a fraction. So, for example, with 79 tone wheels specified you would use 40 voices. Keep
in mind that these voices are permanently allocated and running while the KB3 program is
selected, and cannot be stolen. The additional voice used by KB3 programs, by the way, is for
keyclick.

Upper/Lower Swap

Use this parameter to swap the upper and lower tone wheel groups (that is, to use sample-based
tone wheels for the lower positions and waveform-generated tone wheels in the upper
positions). Setting this parameter to On changes the available values for upper and lower
transposition.

Wheel Volume Map

The wheel volume map determines the volume level for each tone wheel. We've provided
several tone wheel volume maps here, based on measurements we've taken on different organs.
Equal is a map with all tone wheels at the same volume. It's not based on a real B3. Bright is a
good normal map, based on a B3 in good condition. Junky is based on a B3 with an uneven,
rolled-off response. Mellow is somewhere between Bright and Junky.
You can also apply EQ to control wheel volumes base on the frequencies of each tone wheel. See
page 6-59.

Organ Map

The organ map controls the relative amplitude of each key, per drawbar. Like the wheel volume
maps, these maps are based on measurements we've made on actual organs. Equal uses the
same volume for each key and drawbar, and is not base on a real B3. Peck's is a good normal
map, from a B3 in good condition. Eric's is a bit more idealized; it's smoothed out, but less
realistic. Bob's is more uneven, based on an old B3.

Lower Transpose / Upper Transpose

These two parameters let you transpose the upper and/or lower tone wheels in semitone steps
away from their default tunings. The available ranges of values for these parameters depends on
the setting of the Upper/LowerSwap parameter.

Lowest Pitch

Here you can specify the pitch of the lowest tone wheel, which is typically set to C2. The rest of
the tone wheels—as many as you have specified in the NumToneWheels parameter—will be
tuned in semitone steps above this pitch.
6-50