Alesis ModFX Specifications download pdf (Page 31)

Using the Bitrman

What is Ring Modulation?

Ring Modulation was first used in modular synthesizers. Ring

modulation happens when two signals are multiplied by each

other, creating sum and difference frequencies that aren’t in the

original source. The resulting sound is sort of like an electronic

tubular bell, noise, or metal bars being hit, depending on the

difference between the two frequencies.

When the Bitrman’s in RING MOD mode, an internal digital sine

wave oscillator is used to amplitude-modulate the incoming input

signal. The [BITRNESS] knob controls this modulating

frequency, from off at full counter-clockwise to several thousand

Hertz at full clockwise. Low settings of [BITRNESS] in RING

MOD mode result in a tremolo effect, made into an autopan effect

in stereo because the modulator’s phase is shifted 90° between

channels. As you raise the control while playing a single tone,

you’ll hear the original tone, plus another one going up, and

another one going down. As the ring mod frequency increases, it

will sound distorted in a “signals from outer space” kind of way.

At a full clockwise setting, the Ring Mod source is very high,

resulting in a spaced-out metallic whistling sound, since the sum

and difference signals are so far from the original signal.

Inbetween those two extremes, RING MOD produces a unique

synthesized distortion effect worth exploring.

If you have your Bitrman connected in stereo, you’ll notice that

RING MOD produces some interesting stereo effects.

What is Frequency Shifting?

Frequency Shifting is a relative of Ring Modulation. But instead of

giving you the sum and difference frequencies in the output, it

gives only the sum (higher frequencies), and eliminates the original

pitch entirely.

In FREQ SHIFT mode, the [BITRNESS] knob multiplies the

incoming audio by a higher and higher frequency as you turn the

knob clockwise.

The s ettin g o f th e

[ BI TRNES S] k n ob in Rin g

od m od e s ets the

m od ulating fr eq ue nc y . I f it’ s

o nly 2 H z, th e re su lt will be a

l i g h t t r e m o l o / a u t o p a n s o u n d .

f it’s 10 0 H z, a nd yo u p la y a

4 00 H z n ote, Ring Mo d will

a dd two n on ha rm o nic

i d e b a n d s a t 3 0 0 H z + 5 0 0

z t o t h e o u t p u t .

re qu en c y Sh iftin g is NO T

itch s h iftin g (y ou ca n’ t u se

this to ad d a n in te r va l o f a

ifth o r o cta ve a bo v e th e

inp ut). The pitc h o utpu t in

REQ SH I FT m o de is n ot

h ar mo nic .

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Alesis ModFX Specifications Page 31

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