What x0x firmware are you running?
I rarely sequenced mine externally but there is no reason why env amount and accent should sound different, I assume that you are sequencing it in accordance with the 303/x0x sequencer - ie gate length of roughly 50% duration of step length on untied notes? That can definitely make quite a difference to the feel of a pattern. Accents above velocity threshold (dependent on firmware IIRC) and using arp legato control in OT for slides?
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