The EM55 has 20 megabytes of wave ROM according to their web site, but don't forget, there are 3500 voices. It also has a 16 track sequencer. Go to www.rolandus.com, select EM55, specs * brochures. I own a Roland EM20 and enjoy it, but I found the EM55 to have a greater quantity of the same voices, a real disappointment. I don't know anything about the G1000. Make sure you listen carefully before buying the EM55. Personally, I will wait for their next attempt. Hey Roland, if your listening, think QUALITY, not quantity, what a waste of 20 megs of wave ROM.