afx.rb

require 'open-uri'
require 'open_uri_redirections'
require 'soundcloud'

OUTDIR = 'user48736353001'
Dir.mkdir(OUTDIR) unless Dir.exists? OUTDIR

def save(title, download_url)
  puts title
  file_name = "#{OUTDIR}/#{title}.mp3"
  return if File.exist? file_name

  open(file_name, 'wb') do |f|
    open(download_url, :allow_redirections => :all) { |data| f.write(data.read) }
  end
end

client = SoundCloud.new(:client_id => 'YOUR_CLIENT_ID')
tracks = client.get('/users/user48736353001/tracks', :limit => 200)
tracks.each do |track|
  t = client.get("/tracks/#{track.id}")
  save(t.title, "#{t.download_url}?client_id=#{client.client_id}")
end