PTF is designed as a teaser to get folks to try, and hopefully buy the "real" software. Due to its rather serious limitations, I NEVER suggest PTF(except for someone just wanting to do podcasting or has very modest needs) and instead recommend the free 30-day trial of the full version. Yes, I know that PTF is free, but its a poor introduction to a great DAW. If you need "great", get the demo. If you need "cheap", then I would look at Reaper or Cakewalk by Bandcamp (formerly known as SONAR). Both are very capable and Cakewalk is free
