The metal generator writes riffs, not chord pads: the rhythmic parts change character with each section of the arrangement, the way a band writes a verse riff and a chorus riff.
Metal is included with the Pro and Studio plans; the free plan covers five genres. See pricing.
How the engine writes metal
At 160 BPM the kit is busy and aggressive, the bass doubles the riff low, and the harmony stays dark and close. Send the MIDI at amp-sim guitars and the riffs read as riffs.
From a roll to your DAW
A roll defaults to 160 BPM (every preset and tempo is editable before and after generating) and plays back in the browser through the studio's own synths. When you like a take, export it as whole-track or per-instrument MIDI, or as WAV/MP3 audio — the drum part uses General MIDI numbering, so it lands correctly on any drum plugin. There are step-by-step import guides for Ableton Live, FL Studio and Logic Pro.