ProTrackR (version 0.4.4)

PTTrack-class: The PTTrack class

Description

The four audio channels of the Commodore Amiga are represented as tracks (the PTTrack class) in a PTPattern.

Slots

data

A matrix (64 rows, 4 columns) of class raw. Each row implicitly represents a PTCell object, where the raw data is formatted as specified at the PTCell documentation. Use the PTCell-method to make an element of a PTTrack object explicitly of class PTCell. Row numbers correspond with the row numbers of PTPattern objects.

Author

Pepijn de Vries

Details

The Commodore Amiga original chipset supported four audio channels. Meaning that audio could be played simultaneously and independently on each of these channels. Two channels (2 and 3) were hardware-mixed fully to the right stereo outputs and the other two (1 and 4) fully to the left stereo outputs.

This class represents such a single channel, referred to as a track. A PTPattern is composed of four such channels. As a ProTracker pattern consists of 64 rows, a PTTrack object is also (implicitly) composed of 64 PTCell objects.

Use the PTTrack-method to construct or coerce objects to a PTTrack-class object, or to replace such an object.

Examples

data("mod.intro")

## Get track number 2 from pattern
## number 1 of mod.intro:
chan1 <- PTTrack(mod.intro, 2, 1)

## Create a blank track:
chan2 <- new("PTTrack")

## Get two more tracks:
chan3 <- PTTrack(mod.intro, 1, 2)
chan4 <- PTTrack(mod.intro, 4, 3)

## combine the four tracks in a
## new PTPattern:
patt <- PTPattern(cbind(
  as.character(chan1),
  as.character(chan2),
  as.character(chan3),
  as.character(chan4)
))