For the recording , Clapton used a wah - wah pedal guitar effects unit for the first time .
Atlantic brought in engineer Tom Dowd and producer Felix Pappalardi to work with Cream on their next album .
For the recording , Cream used a wah - wah pedal guitar effects unit for the first time .
Atlantic brought in engineer Tom Dowd and producer Felix Pappalardi to work with Cream on their next album .