I used Roland products for about 16 years. 880-1880-2480. Just retired my 2480 last month and sunk about $10k into computers, protools, digital mixers ect. Still loved the Roland. It was just time.
For years I used a single rack space Antares tuner. (They are all over ebay) I came out of the left output of the Roland, into the tuner, and back into a Chanel. You have to mute all channels not being tuned. (1 at a time) and keep the volume of the new tuned Chanel off.
It worked well.