Moog MP-201 Technical Information download pdf (Page 11)

well. Vintage sequencers were typically designed so there were a certain

number of "steps". The term "step" refers to the individual components

of a pattern. For instance in a bar of music in 4/4 you have four quarter

notes. If the rhythmic activity is no more complicated than quarter notes,

this would correspond to four steps. In vintage analog sequencers, a

sequencer typically had eight or sixteen steps available to build a pattern.

In its simplest form, as a sequencer plays back its steps, each step can

be programmed to send a trigger signal, or step can be passed over like

a musical rest. The trigger signals can then be used to trigger envelope

generators according to the way each step is programmed - creating a

rhythmically reoccurring pattern.

ANIMATION

The MIDI MuRF’s Animation contains a simple 8-channel

sequencer, one channel for each lter, each capable of triggering an

Envelope Generator that shapes the volume of the lter. In a Pattern,

each channel can be up to 64 steps long, and each channel can have a

unique number of steps. The MIDI MuRF MIDI controller and Pattern

Editor Application allows the user to customize most of the Patterns

in the MIDI MuRF. For each step, on each channel of a pattern,

the corresponding lter’s envelope can be triggered, or paused. The

ENVELOPE control morphs through different envelope shapes as you

turn it, creating effects that are highly rhythmic in nature, or are swirling

and ethereal. The RATE control sets the speed of the pattern. The

patterns, selected by the PATTERN selector rotary switch in conjunction

with the FREQ slider switch, have been selected to provide a useful

variety of rhythmic timbral effects. There are a total of 24 patterns,

arranged in two banks of 12: one bank for the BASS voicing and one

for the MIDS voicing. Note that pattern 1 and 13 are xed as having no

Animation and can not be modied by the user.

An easy way to understand the Animation is to look at a simple

pattern displayed on a grid Figure 10 shows a graphic representation

of pattern 2 in the MIDS setting. The columns going left to right are

the steps of the pattern. The rows going from bottom to top are the

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1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 35 36

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Moog MP-201 Technical Information Page 11