Etty Lou Farrell, the wife of Jane’s Addiction frontman Perry Farrell, revealed the reason behind the band’s onstage brawl in Boston on Friday night.

On Saturday morning, she posted a message on Instagram giving “a first-hand account of what happened on stage,” claiming there was “a lot of tension and animosity between the members” of the band.

Jane’s Addiction had just started playing their hit “Ocean Size” on stage at the Leader Bank Pavillion when the 65-year-old frontman became frustrated because the band was so much louder than his vocals that “he was screaming to be heard.”

“Perry’s frustration grew night after night. He felt like the volume on stage was extremely loud and his voice was being drowned out by the band,” wrote Etty Lou.

“Perry suffered from tinnitus and a sore throat every night. But when the front row audience started complaining all the way up to Perry, yelling at him that the band was going too loud and they couldn’t hear him, Perry lost it.”

Video footage shows Farrell cursing into a microphone and approaching the band’s guitarist Dave Navarro before punching him. After Farrell was held down by several crew members and bandmate bassist Eric Avery, the concert ended early.

Backstage, according to Etty Lou, who claims she “won the fight,” Avery “walked up to Perry in the dark, behind Dan, grabbed Perry in a headlock and punched him three times in the stomach.”

“Perry was a crazy animal for the next half hour — he didn’t calm down, he just broke down and cried and cried,” she continued. “Eric, well, he either didn’t understand what de-escalation meant or he took advantage of the situation and threw a couple cheap shots at Perry.”

The frontman had previously experienced problems with his voice earlier in the week, telling the audience at Pier 17 in New York that “there’s something wrong with my voice”.

Jane’s Addiction will perform on Sunday in Bridgeport, Connecticut.