ProTrackR (version 0.4.4)

proTrackerVibrato: Get the vibrato table used by ProTracker

Description

Gets the vibrato table as used by ProTracker in vibrato effects.

Usage

proTrackerVibrato(x)

Value

Returns an integer sine value ranging from 0 up to 255 when a valid table index (x) is provided. It will otherwise return a sine value ranging from -255 up to 255.

Arguments

x

integer representing the table index ranging from 0 up to 31. Values outside this range can be used, but will produce results that are not valid in the context of ProTracker.

Author

Pepijn de Vries

Details

As the old Commodore Amiga computer didn't have built-in mathematical functions, many programs on that machine used their own data tables. As did ProTracker for vibrato effects for which a sine function was used. As there was no sine function that could be called, sine values were stored in a table.

This function returns the integer sine values (ranging from 0 up to 255) as a function of the table index (ranging from 0 up to 31).

Examples

## this will return the table as used in ProTracker
proTrackerVibrato(0:31)