On May 21, the court granted Maarohanye an application to call a video expert to testify, even though the State wanted the case against the musician closed.
"Everyone deserves a fair trial, therefore, the expert will testify on May 30 2012, at noon. The time is compromised because the court has an earlier engagement," Magistrate Brian Nemavhidi said at the time.
"I don't want this court to be leaning more towards the State."
Ike Motloung, for Maarohanye, earlier told the court: "The evidence I intend to lead should confirm or dispute that the recording is genuine and has not been tampered with."
"If it was tampered with, someone should get arrested," he said.
The case against Tshabalala was closed on May 21 when his defence counsel finished leading evidence and had no more witnesses to call.
Maarohanye and Tshabalala face charges of murder, attempted murder, and driving under the influence of alcohol and drugs.
They were allegedly racing their Mini Coopers when they crashed into a group of schoolchildren in Mdlalose Street, in Protea North, on March 8 2010. Four boys died and two were seriously injured.