Kendall,
I am afraid that the reverb setting is part of a registration or of a style; the SD1 lets you assing even a different reverb to the drums. Once you have found the setting you like, just press "Save" and choose Registr.
If that can help you, I scrolled through ALL the styles and changed the sound assigned by default to the Low1 part (which was the infamous DX piano), saving all the styles one by one.
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.