Tape speed, motor control, LFO, help!

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http://forum.allaboutcircuits.com – Hi everyone, I'm new around these parts and I have a project I'd like some help with. I am building an effect unit using a reel to reel tape machine. It is a take on an effect created by Ken Townsend for the Beatles called ADT. It used a oscillator to control the speed of the tape machine. It had one large knob to manually vary the speed by small amounts to create the effect. I want to reproduce this effect but I want to be able to set the initial speed manually and have an LFO control the small variations in speed. The motor is a four pole induction type, 100VAC. The motor currently moves (Embedded)