                              Heart Beat
========================================================================
                             version 1.0
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    a patch for the Roland JV-1080, JV-2080, XP-50, XP-60, XP-80, or
                           compatable synth
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                           by Nathan Sheldon
========================================================================


** REQUIREMENTS **

There are no special requirements to use this Patch beyond the need for
a Super JV synth like the JV-1080, JV-2080, XP-50, XP-60, and XP-80.

No expansion boards are required for this Patch.

** PATCH OVERVIEW **

This Patch realisticly simulates, with fair realism, a human heart beat.

** PATCH INFO **

This patch uses 3 Tones:
    TONE 1 is the first part of the heart's beat,
    TONE 2 is the continuous rumble of blood flowing through the body,
    TONE 3 is the second part of the heart's beat.

Timbre Control:
    Modulation..........removes the heart beat and leave only rumbling.
    Pitch Bend..........frequency of the heart beats.

** PATCH SPECIFICS **

TONE 1 uses the INT-B 183 (Low Saw) waveform to create the first, and
loudest of the two beats a heart makes in a cycle.  I use a low-pass
filter with the cutoff frequency set fairly low, at 38, to cut out the
"clicking" sound caused by the saw-tooth wave's "sharp edge."  This
makes it sound more like a "thump" than a "pop."

TONE 2 uses the INT-B 192 (Low Pink NZ) waveform to create the low
rumbling caused by blood moving through the body.  I use a low-pass
filter on this waveform as well with a cutoff frequency of 81 to cut out
the pink noise's upper band.  This makes it sound more like rumbling.  I
also use a random LFO waveform to slightly adjust the rumbling level and
pitch, just enough so it doesn't sound too synthetic.

TONE 3 uses the INT-B 184 (Low Saw inv) waveform to create the second,
and quieter beat the heart makes.  This, the second beat being the
quieter one, is the reason I use a third TONE rather than a a waveform
such as the INT-B 186 or 187 (Low Pulse 1 and Low Pulse 2 respectively).
 When trying to design the sound, I could find no way to lower the level
of the downward fall of the pulse (the second "beat") and still be able
to increase the frequency of the heart beats.  So I decided to use two
TONEs for the entire heart cycle.  This way the second beat's level can
be controlled seperately from the first beat's level.  The use of the
inverted saw-tooth wave give the second beat a slightly (very slight)
different "thump" than the first beat.  Though the difference is
extremely subtle, I feel it is noticeable.  Also, as in TONE 1, I use a
low-pass filter set at the same cutoff frequency to smooth out the
"sharp edge" of the saw-tooth wave.

One major flaw in this patch that I can see is that the delay between
the first and second beat (which is set by the wave delay time) does not
decrease as the frequency of hart beats increases (by going up the
keyboard).  So on the higher keys, the second beat of the first heart
cycle occures closer to the first beat of the following heart cycle,
ruining the illusion of a real heart.  To help remidy this problem, I've
put the SOLO and PORTAMENTO switches ON with both set to Legato mode
only the pitch changes if you press a second key while holding the
first, not the envelopes or anything else).  However, to my dismay, I've
found that when there's a delay time assigned to a TONE, the legato
feature does not seem to apply to the SOLO function, causing an
unnatural delay between "heart beets" when switching keys.  So, I've
also assigned pitch (as would be expected) to pitch bend (as noted
above).  This helps eleviate the need to use other keys to change heart
beat frequency.

** VERSION HISTORY **

1.0  Initial creation and release.

** MISCELLANIOUS **

I hope you enjoy and can use this patch.  If you would like to get in
contact with me for any reason, you can e-mail me at

    nsheldon@geocities.com

I'd be pleased to receive the e-mail.  All kinds of feedback are
welcome.
