Gleim CPA Audio Review Regulation - Gleim CPA Audio Review, Regulation Author:Irvin N. Gleim Audios are an excellent way to learn the material you need for the CPA exam during non-traditional study time, such as driving to work. Gleim's CPA Auditing audio review series consists of one 25- to 45-minute overview for each of the 20 Gleim study units covering the Auditing and Attestation section of the exam.