headway EDB-2 VAP - High Harmonics for Piezo Pickups; Rich H.E.A.T Valve Blending

It is possible to add too much Harmonic Enhancer. If the sound
becomes thin or harsh (“over excited”), back control off or back off
treble
7.1.1 PIEZO PICKUPS - Ceramic, crystal and condenser
microphones:
If sound is perceived as being bright, try putting Enhancer Control in
1/3 CW up position for modest effect then try turning Treble and /or
Presence control pot ACW to fine tune overall sound. This will boost
high harmonic content while reducing lower frequency "clunky"
treble content and the piezo “quacking" response
7.1.2. MAGNETIC PICKUPS, DYNAMIC MICROPHONES AND
FLEXIBLE PIEZO FILM PICKUPS: These tend to be on the over
mellow or boxy side, with magnetic pickups usually not producing
tones above 4kHz -5kHz, while Piezo Flexible Contact Film Pickups
can often produce no higher than 2 kHz. Put Treble Control in the
centre and Enhancer Control pot 2/3 CW to the Right, then try
increasing Treble Control CW as there would then be something
there for it to be able boost. Re-adjust Enhancer Control to your
taste Headway's SAM-1 Magnetic Pickup already incorporates
Harmonic Enhancement Analogue Technology
7.2 ”RICH” H.E.A.T ~ HARMONICS ENHANCED ANALOGUE
TECHNOLOGY - VALVE BLENDING. Utilises Gain Pots, Valve
Level Rotary Pot, Channel Selection ( 3 Way) Switch, On/Off Switch
Located on top - Yellow knob ( Cool to Warm )
The Valve Blend facility is a luxury feature that allows the variable
addition of rich, warm sounding “even” harmonics and some higher
harmonics EDB-2 VAP is fitted from new with a high fidelity, low
P. 43