Yamaha DTXpress/DTXplorer/DTXtreme

Sorry it's taken me a while to respond. While I am
intrigued about Keith's invention, I don't need extra
inputs since I upgraded from DTXpress I to the
DTXtreme IIs.

Cheers!
Nick Carroll


--- emf <liberatusvirus@...> wrote:

---------------------------------

This Special Notice to all members is a survey to
determine how many 
of us might be interested in purchasing Keith Raper's
invention for 
adding inputs to the DTXpress module. Keith's
intention is keep the 
price at around $100.  Membership turnout on this
matter may well 
have a lot to do with what ultimately happens to the
device.  Please 
try to respond, even if you aren't sure of your answer
yet.  A word 
to the wise: This is a huge, possibly money-saving
opportunity for 
those who want to expand their kits in a
cost-effective manner.  For 
a detailed description, read below.
 
Keith's input device--which we referred to as the
"magic box" before 
its actual invention (it will acquire a better
name)--allows e-
drummers to expand the basic DTXpress (I, II or III)
module by 
permitting the FSRs and piezos on stereo inputs to be
split.  
Normally each stereo input is compatible with only one
pad or one 
cymbal, even though each stereo input is capable of
supporting more 
than one sound. Keith's device enables two single-zone
(mono) pads to 
be connected to each stereo input on a DTXpress
module. By "stereo" 
in this context, we exclude all of those that are
capable of three 
sounds (inputs 2 and 6), which should be reserved for
their triple 
voices, and input 9/10, which is not compatible with
the device.  

The limitation in this method of input expansion
follows from the 
limitation inherent in any pad or cymbal with a rim
switch; only one 
sound per split input is possible at any one time. In
other words, 
just as a stereo pad will produce either a
piezo-center sound 
(head/bow) or switch sound (rim/edge) but not both
simultaneously, 
the two pads connected to any input split via Keith's
device will not 
be able to make their sounds together. They must be
hit 
successively.  

This is not a flaw in Keith's design but a
characteristic of Yamaha's 
stereo electronics. The magic box would therefore be
most effective 
in circumstances when pads sharing the same input
would be unlikely 
to be hit simultaneously--for example, a cymbal and a
tom rather than 
a cymbal and a kick pad.

Keith has planned the device to have 8 inputs and 4
outputs, allowing 
4 extra pads to be added to each module. For example,
the three tom 
inputs and one cymbal input could be used to add four
extra pads, 
while still leaving 9/10 free for two more.

The box adds gain to each of the channels to
compensate for the 
DTXpress module's relative lack of sensitivity to
rim/edge hits.  
Boosting the signals solves this problem completely.
The two pads 
connected to any one input on the device will have no
adjustment for 
rejection. Protecting them from each other's
reverberations will be 
purely a matter of positioning on the rack or
otherwise manually 
isolating them.

The device may well be compatible with Roland,
Pintech, or any other 
piezo/FSR switch components, but it has undergone
testing only on 
Yamaha equipment.

Keith, OGD, and Ed





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