Yamaha DTXpress/DTXplorer/DTXtreme

Some basics. 
 
With Yamaha edrums you start with three types of rejection settings. 
 
The first is the rejection that the pad has to itself. If the setting is to
low, then it may trigger a second time from just one strike. If the setting
is to high then a quick second strike may not register because the Module
thinks the second strike is actually a secondary vibration, as oppose to an
actual strike and will cancel it out. You are setting the time delay between
strikes in effect.
 
The second is the rejection that the pad has to a second specific adjacent
pad. When you are setting up the pad plugged into trigger input 2 and
everytime you strike the pad plugged into trigger input 3 hard, you get the
sound for pad 2, as desired, but you also get the sound from pad 3, then the
specific rejection for that pad (2) can be setup to ignore strikes from pad
3. The downside is that if you truely what to hit both pads simultaneously
and the rejection setting is high, then if you hit pad 3 a microsecond
before pad 2, then pad 2 maybe ignored. If you set the rejection setting too
low then may get both sounds everytime you strike the pads hard. This
setting must be used with a high specific rejection setting when using a
BP80 barpad or when you mount a PCY10 bell pad on the same arm with a PCY65S
cymbal pad. Because you are dealing with two piezo's in close proximity with
each other, striking one pad will vibrate the second pad enough to trigger
it, unless the specific rejection is set fairly high.
 
The third rejection is to the other kit pads in general and to general rack
vibration - ie. the rack sitting next to a bass amp. A low rejection setting
may cause the pad to trigger if several of the adjacent pads are struck or
if you have a environment with a lot of external vibrations being generated.
A high setting will help reduce false triggering of the pad from an external
source.
 
The problem with all of this is the module is simply not smart enough to
know where the vibration is coming from that is causing the piezo to
vibrate. It cannot tell if the initial vibration it is detecting is coming
from a light strike of the pad itself, from a heavy strike from an adjacent
pad or from an 18" subwoofer that is shaking the crap out of the drum rack.
All the module knows is that the piezo is "moving". 
 
When you throw into the works the additional settings, such as sensitivity
from 0-100 or velocity curves, it just makes it worse for the module to
figure out what in the world am I suppose to do here, trigger or not
trigger.
 
Thus, each environment that you use the kit in will effect each of these
settings, there is no simple answer. You do have the ability to save user
trigger settings, I only use my kit in one environment so I only need one
trigger setup. If I moved it around I am sure I would have to have multiple
settings. 
 
So, basically you will need to do a little trial and error and come up with
some basic settings that will work in most environments that the kit will be
used in. For example one setting for using in a studio using headphones and
one for small venues.  [If you are playing in a large venue then, you should
be able to afford a tech guy that can figure it out for you... ; ).]
 
I know this doesn't give the "answer-solution" but I hope it will help you
and others to understand some of whats involved in tracking down problems
like this. Typically if you have a problem and it occurs everytime you
strike a pad, regardless of where the kit is setup, how you are monitoring
it or what kit/song you have set, then it most liking is a physical
problem. But, if you can make it "go away" under certain conditions, then it
is probably a trigger/pad setting problem.
 
 
OGD
 
 
 
 

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From: drumsonly2002 [mailto:dan@...] 
Sent: Sunday, June 27, 2004 10:29 PM
To: DTXpress@yahoogroups.com
Subject: [DTXpress] Snare dropping out sometimes


hello all. I have a DTXTreme-2 and have a snare dropping out every 
second bar. Played a prom gig and only used 3 toms, kick and snare. 
Used acoustic hats and cymbals. 2 monitors, JBL EON and Yamaha 
keyboard amp. Had the JBL cranked. Contacted Yamaha and they think, 
1. pad, 2. cord, 3. module. Through headphones I cannot reproduce 
the problem. Turned the self reject and reject to it's lowest 
settings on the snare. Someone mentioned that the speaker could be 
causing my pizeo to "feedback" causing the note to cancel once in a 
while. When the snare doesn't trigger it's while doing a simple rock 
beat. I noticed the gain on my pad was turned all the way up so is 
it possable to overload the imput of the module?
 
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