The Juno 6/60/106 indeed does have two filters. The latter is a very special non-resonant HPF. Special, because when “turned off” it boosts low frequencies like an EQ. So you’ll need the A4’s second filter to simulate that low boost. Either with a HPF again or you could try the peak mode.
The biggest problem when simulating Roland sounds on the A4 is the filter characteristics, as the Roland filter sounds very smoothly and characteristic. You can’t do that easily when it comes to resonant sounds.
But then again it depends on how close you want to get. For the purist only the original will do, if it’s just the basic patch-settings you might come close enough.
Use moderate Resonance, and Filter ENV-Amount settings. Turn down the OSCs so not to distort the filter too much. Compensate gain loss on your mixer! You’ll find the A4 can sound thicker and smoother when keeping OSC levels below 50.
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