DYNEX makes a really cheap dock that fits all of the older iPods. You can get them on ebay or Amazon for like $20. They even come with a remote which controls the iPod when in the dock. I have several and like how they function. They have an analog output jack to RCA connector which goes into almost all analog inputs. The only drawback is that the signal from the iPod is less and you have to turn the volume up more. You can also use the 3.5 mm jack-RCA cable to feed a processor directly from the earphone output to a tape input connection.
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Music system
Model 990/7500/Magnepan 1.6 QRs/Technics SL1200 MK2/Aperion S-12 Subwoofer/OWA3/Sony NS75H DVD
APC H15 Power Conditioner

TV System
Large Advent Loudspeakers/ Polk center/Monoprice surrounds/Panasonic Viera 42 inch/Onkyo HT-RC260/Sony BDP S590/Directv


Home Theater System
Onkyo PR-SC886/Outlaw 7125 Klipsch RF-82 L/R,RC-62 center, RB-35 SR/SL, BENQ HT1075, Outlaw LFM1-EX/OPPO BDP-83/Directv
Harmony ONE
Blue Jeans and Monoprice interconnects
APC H15 Power Conditioner