Guyatone PS-021 GUITAR EXCITER

I'm not a guitarist, but I believe every playing guitarist
should have this unit.

My friend used one on his setup around 1986, in line
after the distortion unit, such as Boss's Heavy Metal.
You could get virtually any kind of distortion sound
with it, because the "Color" control, you can vary the
harmonics from even to odd. The "Exciter" adds a
brilliance to the sound, similar to the Aphex Aural Exciter,
so it can even be used for vocals.

With the "Color" turned to the left, around 9 o'clock, you
would get even harmonics, close sounding towards a
tube amp's distortion.

Placed after the distortion, you could step on it when
you wanted to do a solo, as it would boost your sound
level up as well.

This was a really versatile, superb and underrated effect,
and none of the other effects manufacturers made an
equivalent unit. The closest I could find at that time as
Dod's Harmonic Enhancer, and this had no "Color" or
compressor built in. Boss had no such effect in their
immense armamentarium. Coron had and Exciter as found on
the net, but this was not available in Malaysia, and also
had no "Color" or compressor effect.

Most guitarists were ignorant of the existence of this effect.

Superb "Color" control lets you vary between odd and even harmonics.

Built in compressor, low noise.

"Exciter" control adds brilliance and depth to your sound,
similar to the Aphex Aural Exciter.