The Spice Girls' former voice coach has slammed Mel B for saying Victoria Beckham had her mic turned down.

Although, she admits that when they harmonised together they were much stronger.

Pepi exclusively told BANG Showbiz: "I was surprised Mel did say that, because each one of them had defects. "They weren't trained properly, and each one of them had weaknesses that had to be strengthened, but singing as a group they were strong.

"I think Mel was unfair for saying that, not one of them was a vocal diva. "

Pepi was full of praise for the iconic girl group - also comprised of Mel C, Emma Bunton and Geri Horner - and their unique singing qualities, but admitted Posh had to be trained to "blend in" with the rest of them.

She continued: "They all had to be trained in their own way. Mel C had a good soul sound, Emma had a pretty voice, a pretty vibrato.

"Geri had the hardest part because singing wasn't the most natural thing for her to do, Neither was it natural for Victoria to sing, she wasn't a natural singer.

She had to be trained so she could blend in with the others and forma group."

Pepi - who has also trained Madonna and The Beatles - helped the girls learn how to use their voices and would make them practice daily.

She added: "With Victoria, and all of them, she had to discover her voice.

"The only way to understand what you have is to train. I helped her (Posh) with tuning, how to project - which is incredibly important - how to breathe, I showed her how to stretch her voice so she wouldn't harm it.

"I would make her - and all of them - practice individually every day, practice scales, make their voices stronger."

Pepi's debut solo album 'Back2Front' is out now.