I haven't tried the dual/split modes on  the Jupiter 8 much in the 10 years I've owned it! :)
So I decided to try it out today, and man does it sound silky, rich and lush!

Hard to believe it's vintage analog sometimes, it's so refined sounding.

I'm guessing this is what Roland is going for in the Jupiter 80....

Jupiter 8 Dual mode layer noodling

Acidlab Miami 
Akai AX80 
Akai Miniak
Akai XR20 
Alesis DM5 
Alesis E-Drum 
Alesis Fusion 
Alesis QSR
Arturia Microbrute 
Bontempi POP5
Boss BD-1
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Boss DR-55
Boss DR-670 
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Buffet Crampon E13
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DIY Big Muff Pi
Doepfer MS-404
DSI MEK
DSI Mopho
Elektron Machinedrum SPS-1 
Elektronika EM-25
E-mu Proteus 2000 + XLead 
E-mu Shortboard 
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Fender Jazzmaster Japan
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Fender Squier Mustang Bass 
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Fender Stratocaster SCN 
Hohner Marine Band Deluxe
Ibanez GA1G
J&D Fretless 5str bass
Hing Hon EK001
Kawai R-100
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Kurzweil K2661s
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Novation Xio25
Peavey Windsor 20
Roland Alpha Juno 1 
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Roland Fantom XR 
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Roland JV-880
Roland RS-09
Roland SA-300
Roland S-50
Roland S-760
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Roland TR-626 (x2)
Roland XV-5050 
Sentimental Bob Pro co RAT
Vermona Formation2
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Vermona Synthesizer 
X-Wave Yamaha YMF754
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Yamaha FX-550
Yamaha PC-1000
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Yamaha PSR-290
Yamaha PSR-E363
Yamaha QY20 
Yamaha RX15
Yamaha TX802
Yamaha TX81z
Zoom MRS-8

My YouTube channel

http://www.youtube.com/user/CoolColJ