Just a single volume pedal will work for my need really.

Diki,
I'm lucky with how my Roland works too. When I set a controller either by D-Beam or Volume that effect is only applied to the current track--and not the entire performance. I can also record volume changed live into my RS-70's sequencer using the D-Beam alone.
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.