Testing if the TD-3 firmware 1.2.5 does midi slide properly. The answer is NO. Used the test pattern from http://antonsavov.net/cms/projects/303andmidi.html

First you hear the pattern play as it should, from n0nx0x2 which has a flawless midi implementation.
Next you hear how the TD-3 interprets the midi.
As described in the above article: "The pattern becomes fragmented, and/or some notes get cut-off short, and/or some slides are gone."

UPDATE: The issue is now fixed in the 1.2.6 firmware: https://soundcloud.com/rv0/n0nx0x2-vs-td3-midi-round-2

n0nx0x2 vs TD3 Midi

Demo sounds and other snippets used on http://www.rv0.be