The Mellotron Group

Thanks to everybody who gave advice about the M300 sound, I have split the output on my tron as advised and it sounds closer to what I want but still not right. I think it might be the quality of digital reverb on my inexpensive mixer, I wondered about buying a seperate reverb to put between the tron and the mixer. Would it be best to use a spring reverb or a digital reverb like the alesis?

Mark