For a violin you could always pull a EVH / Malmsteen... use a delay and work the volume pot with your pinky, that's always fun. If you don't have the volume knob close enough you could always use a volume pedal.
There's the Boss Slow Gear if you don't want to fiddle with the volume pedal. It's an envelope filter, like an auto-wah, but it swells volume instead of sweeping a bandpass filter. Guyatone has reissued it.
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