Marcos, I bought a 5080 to use as a sound generator with my G1000...
The 5080 could not handle the midi data from the G1000 very well..it had lags and glitches..It definately is the problem of the 5080...I used other sources for sounds without problems[XP80, JV1010 and naturally all the GS instruments from Roland]..
Just a word of caution,,try the combination of your arranger and the 5080 first..before you commit to buying a 5080 for that purpose..
I loved the 5080 for what it does,but it didn't work well with my arranger..