This drum kit is based of of Phill Flood’s B3 Organ Drum kit and Lead synth drum kit. The Mellotron “strings” start at midi 91 (G2) and go up 3 octaves). I have included Phil’s original MIDI mapping for B3 organ
https://www.dropbox.com/s/x2a1dmb9jm8zpfl/Mellotron%20string.zip?dl=0