Live Looper (controller)

# key: live looper
# point_line: 1
# point_index: 2
# --
# filename: ctl-live-looper.rb

set :metro_vol, 0.5
set :my_bpm, 120
set :playback_master, 10
set :rec_level, 2
set :track1_len, 8
set :track2_len, 16
set :track3_len, 8
set :track4_len, 8

# What this does:
# If you press knob no. 1 at Arturia Minilab2 it will evaluate the code from
# 'lib-live-looper.rb' and start the recorder
# You can switch/arm the tracks from 1-4 with pad 1-4 or disarm all with pad 8
# Press knob 1 again and you will be able to record starting from the next
# synchronisation of :metro (as long as 'get(:track[n]_len)').
# Switch tracks, disarm all or press knob 1 again with same track armed to
# delete the recording.

# Setup:
# This controller script can be loaded via snippet 'live looper'
# It calls the file:
# ~/projects/sonicpi/playground/code/lib/lib-live-looper.rb
# via the init.rb referenced as 'live_looper'

# Preparation:
# Switch Arturia to midi channel 2 (Shift - Pad 2)

# Controls (on Arturia Minilab MK2)
# Pad 1-4, arm track 1-4
# Knob 1: Evaluate script (start recording)
# Knob 13-16, set volume for playback of track 1-4

live_loop :control_change do
  p = sync "/midi/midi_through_port-0/*/*/control_change"
  
  # After pressing knob 1 it will return velocity 127 and immediately velocity 0.
  # Thus it works as a toggle and runs the code only once it is pressed.
  if p[0] == 113 and p[1] == 127 then
    
    run_file live_looper
    
    if get(:track) == 0 then
      puts "-----------------------------------------"
      puts ""
      puts ""
      puts "               No Track armed.           "
      puts " "
      puts " "
      puts "-----------------------------------------"
    else
      puts "-----------------------------------------"
      puts ""
      puts ""
      puts "Starting recording on TRACK No. #{get(:track)} ..."
      puts " "
      puts " "
      puts "-----------------------------------------"
    end
  end
end