Two victims of Roast Busters' ringleader Joseph Parker have spoken out after learning he wrote a song referencing the incredibly traumatic chapter of their lives.

On Monday in an exclusive interview with Newshub's Karen Rutherford, former Roast Busters' ringleader Joseph Parker talked about his role in abhorrent group sex sessions between 2011-2013.

Many of the girls involved, some of whom were from west Auckland, were drunk and underage.

Since leaving New Zealand for the United States four years ago, Mr Parker said he has changed "mentally and spiritually" and doesn't believe "we were the monsters people thought we were".

But the launch of a song by Mr Parker, with numerous references to his experience with the Roast Busters, has left two of his victims angry, including one who laid a rape complaint against him in 2013.

"He's been in the [United States] doing God knows what, but we're back here dealing with his. It still affects me every day," she told Newshub.

On Tuesday's Newshub Live at 6pm, Mr Parker's intentions for going public with his story will be explored, including asking if he is just seeking publicity as he attempts to launch a music career.

Questioned by Rutherford on if speaking out was an attempt to capitalise on the hurt the Roast Busters caused a lot of young women, Mr Parker said: "No, I would hope they don't think that... it's more of a declaration to say I want to turn the bad in my life into something that's good".

"It's in my blood I'm an artist naturally, it's not like I thought I'm going to write a song about the Roast Busters etc. I've been making music since before then, and as an artist you write about your life," he said.

But his now-20-year-old victim said that doesn't make the pain go away.

"He can explain this as much as he likes, but he's done his damage and I have no forgiveness."

Another of his victims said Mr Parker will never understand there are "so many of us still hurting".

"If he was 100 percent genuinely changed, that's great. But he doesn't seem like he is," she told Newshub.