Get a corresponding period value from a note string

Back in the days, ProTracker was hardware driven on a Commodore Amiga. It made advantage of a custom chipset where each chip had specific tasks. One of the chips (named Paula) could play 8 bit audio samples stored in memory directly to one of the four audio channels. On that chip you could set the integer 'period' value which is inversely related to the sample rate at which the sample is played. Hence, it defines the pitch of the sample. ProTracker used the period value to play different notes. With this function you can convert a character string representing a note to its corresponding period value used by Paula.

Usage

pt2_note_to_period(note, empty_char = "-", finetune = 0, ...)

Arguments

note

A character string representing notes (see also pt2_note()).

empty_char

A character that is used to represent empty values.

finetune

ProTracker used integer finetune values to tweak the playback rate. it should be in the range of -8, up to +7.

...

Ignored.

Value

Returns a vector of integer period values.

Examples

pt2_note_to_period(c("A#2", "C-1"))
#> [1] 240 856