Sonic pi sample fader both in and out

sampleFade.rb

define :_togglePan  do |pan|
  if pan == -1 then pan = 1 else pan = -1 end
  return pan
end

define :_calcFadedAmp do |isFadeIn, amp, ampFade|
  if isFadeIn == true then amp += ampFade else amp -= ampFade end
  return amp
end

define :_fadeRepeater do |sample, times, sleep, amp, pan, isFadeIn, ampFade, togglePan|
  
  
  times.times do
    sample sample, amp: amp, pan: pan
    if togglePan == true then pan = _togglePan pan end
    amp = _calcFadedAmp isFadeIn, amp, ampFade
    sleep sleep
  end
end

define :sampleFade do |sample, times: 1, sleep: nil, amp: 1.0, pan: 0|
  puts "sample:", sample, ", times:", times, ", sleep:", sleep, ", amp:", amp, ", pan:", pan
  
  isFadeIn = false
  if times == nil or times == 0 then times = 1 end
  if times < 0 then isFadeIn = true and times *= -1 end
  if sleep == nil or sleep < 0 then sleep = sample_duration(sample) end
  if amp == nil then amp = 1.0 else amp += 0.0 end
  if pan == nil or pan == 0 then togglePan = false else togglePan = true end
  
  ampFade = (amp / times)
  if isFadeIn == true then amp = ampFade end
  
  _fadeRepeater sample, times, sleep, amp, pan, isFadeIn, ampFade, togglePan
  
end

repeat_crow = 6

define :func do |a, b: 0, c: 0|
  print "func", a, b, c
end

func 1
func 1, b: 2
func 1, c: 2

in_thread do
  sampleFade :misc_crow, times:repeat_crow * -1
end
in_thread do
  #sampleFade :misc_crow, repeat_crow
end

in_thread do
  #repeat_crow.times do
  #  sample :misc_crow, amp: 1.0/repeat_crow
  #  sleep sample_duration(:misc_crow)
  #end
end

https://in-thread.sonic-pi.net/t/function-overloading-functions-with-the-same-name-but-different-params/7361