开云体育

Jeff

The perc circuitry needs something to figure out when a key has
just been pressed down so it can um, "perc". On the hammond consoles
they do this by 'stealing' one of the busbars, so that when you hit any
key, that busbar effectively gets grounded (almost, it's still a few
ohms above ground). This signal is sent to the percussion trigger input.
The perc circuitry in the preamp sees this voltage go low, and provides
a short term boost to either the note from the 4th bus (2nd harmonic) or
from the 5th bus (3rd harmonic).

Because once you press a key and hold it down, you've triggered the
percussion, so playing any additional notes will not retrigger the
percussion attack until you've gone back to 'all notes up'. To get all
the notes to each make a percussion attack, you have to learn an
'anti-legato' technique that makes sure that any key comes all the way
up after it's played and before the next key is pressed.

When you turn percussion off, the 9th drawbar gets it's note back.
On some spinet models and any other non AO-28 preamp organs, the perc
trigger might come from another bus, not necessarily the last one.
There's a part of the Hammond FAQ that describes how to move this from
the 9th to whatever other drawbar you'd like to assign it to.

Class dismissed!

pda
Jax Fl.


jlc7184@... wrote: