Kurzweil Forte - Manual (Page 184)

Program Edit Mode
KB3 Editor: The Tone Wheels (TONEWL) Page
7-87
UpperTWKeymap (Upper Tone Wheel Keymap)
Use this parameter to indicate the keymap (and thereby the samples) to use for the upper
tone wheels. You can use any keymap from ROM, though you must specify a keymap that
uses looped samples for KB3 Mode to work correctly. When Keymap 150 is selected, DSP-
generated waveforms are used for the upper tone wheels, and none of the Forte’s 128 voices
are used.
Upper Vol Adjust (Upper Volume Adjust)
This parameter lets you adjust the amplitude of the upper tone wheels relative to amplitude
of the lower tone wheels.
NumToneWheels (Number of Tone Wheels)
This parameter lets you specify the number of tone wheels used by a KB3 program. The
classic tone wheel organs used 91 tone wheels, though the lowest 12 were for the pedals
only. Therefore, you may find 79 a good number of tone wheels to specify for realistic organ
emulations. You can specify up to 91 tone wheels.
When Keymap 150 is selected, DSP-generated waveforms are used for the upper tone
wheels, and none of the Forte’s 128 voices are used no matter how many tone wheels have
been selected. When Keymaps other than 150 are used, the number of Forte voices used by
a KB3 program is typically half the number of tone wheels selected (in some cases 1 more
voice may be used).
So, for example, when using a Keymap other than 150, 79 tone wheels would use 40 voices.
This would leave you 88 voices for other programs. Keep in mind that these voices are
permanently allocated and running while the KB3 program is selected, and cannot be stolen.
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 based 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.
Wheel Vol Map (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 based on the frequencies of each tone
wheel. See KB3 Editor: The EQ Page on page 7-96 .