Some 808 slide midis are marked with N.E. At the end.

this stands for "No envelope"

This means the slides for this midi will only work if you DO NOT touch the 
LFO envelope of the 808 at all!

You can enabled cut itself, but do not adjust the envelope. 

The specific notes that are supposed to be slide notes are described in the midi file name.

PLEASE READ Intructions(IMPORTANT).PDF for full information.