Sonic Pi snippet for Ableton Link downbeat sync

AbletonLinkDownbeatSync.rb

# Credits: https://in-thread.sonic-pi.net/t/demo-of-experimental-ableton-link-with-sonic-pi/5869/28
# Call beat_fix with desired quantum just before defining your loops

use_bpm :link
sched_time = 0.5
$latency = 0 + sched_time*1000.00

def beat_fix(quantum=4)
  diff = @tau_api.link_current_time_and_beat(false)[1] % quantum
  x = ((quantum-diff) + 0 - rt($latency/1000.0)) % quantum
  epsilon = 0.02
  sleepytime = (x < epsilon or x > (quantum-epsilon)) ? 0 : x
  sleep sleepytime
end

beat_fix()