In working with uSEQ, I’ve seen reference to a few functions such as:

FAST, SLOW, OFFSET

These functions are not explicitly described in the current documentation, but used in various ways such as:

(from-list [1 2 (from-list [1 2] bar)] (slow 2 bar))

Being an opensource project, I was able to fetch the source and looking at the file uSEQ/src/uSEQ.cpp I found the definitions for the above.

From these definitions, I can see that the above functions take two arguments, the first of which is an array of two numbers and the second is an “environment”. The concept of an Environment is defined in uSEQ/src/lisp/Environment.cpp, appears to me to be similar to the concept of lexical scope, and is basically handled by modulisp. As a user the first argument’s two values are what is provided, one a number and the other a phasor.

Looking at the meat of these functions, they perform the following:

FAST: multiplies by the provided factor
SLOW: divides by the provided factor
OFFSET: adds the provided offset.

The effect of this is to transform the “phasor” by applying the above rule in a new environment linked as a child to the original. This allows for modifications to the parent to ripple down to the child environments.

This does seem to imply that the global BPM is used throughout the system and defining systems with multiple BPMs is not currently not supported. Something I’ll definitely ask about in the Discord server.