I used Nlog Synthesizer and Hammerhead both free just recorded 3 riff and put together in post editing. This was recorder through a pc and just at the end I realized I had the iphone volume low so it’s a little distorted because I normalized the audio after recording the riff. I couldn’t find the way to avoid recording the metronome with SONAR LE (spento more time on trying this than recording and editing). Starring and dancing Deedee the shih-poo dog! This free synth is really cool and easy to play configure and has many good sounds. Same thing for the Hammerhead I suggest you to quickly create a drumloop.