Most arrangers and low end workstations either won't send accompaniment outright or require complicated file translation gymnastics on some of the more expensive models.
Manufacturers are trying their damnedest to drop the old MIDI standards and lock you into their exclusive environment these days where professional features raise the price at a rate of 5% per feature on their product lines.
Be thankful your dumb old technics still has the feature and never sell it off until you die and are buried with it. Real MIDI is worth its weight in gold.
Case in point, I just picked up a Korg EK-50 to mess around with and discovered a very obvious lack of DIN MIDI ports.
I haven't hooked it up to any computers yet and will probably end up never but all my previous Forays into Korg territory have required the installation of horrendous and buggy driver and operating software upon my computer which I'd just as soon rather not deal with.
If I were to venture an educated guess after glancing at the manual I'd really be shocked if this this thing transmitted accompaniment sequences via even the lousy USB MIDI it ships with.
Another example of how predatory Korg is?
They sell an $800 "professional" keyboard without a lousy power adapter?!?!?!? And no DIN MIDI to add insult to injury.
I have 30 days to test and evaluate this thing but seriously I'm supposed to run it on 8AA Cells??!?!?!?
The bean counters over at Yamaha must have assimilated Korg Execs in their sleep.