Alive!, Kiss‘ first concert album, couldn’t have become a hit at a better time for the band. Three albums in, the flamboyant group had yet to crack the Top 30 and was reportedly living off of manager Bill Aucoin’s credit card.

But then Alive! shot to No. 9 following its release on Sept. 10, 1975, powered by the sense that the band’s explosive energy had finally been captured on vinyl. “It was a party,”  drummer Peter Criss told VH1. “It was an event.” It was also Kiss’ first gold record and label Casablanca’s first-ever Top 10. The group would string together an unbroken series of platinum recordings for the rest of the ’70s.

But even now, all these years later, we still don’t know how much of Alive! is actually, you know, live.

Made during an era when overdubs were more rare, the album has since come under scrutiny. There have been questions about whether Gene Simmons and Paul Stanley overdubbed parts after the fact, and there are even accusations that the cheers from the crowd weren’t exactly authentic. (The Rolling Stone Album Guide makes particular mention of “fake-sounding audience noise.”)

Producer Eddie Kramer has been honest about the post-production work. “We had to create that album from the live shows with overdubbed guitar, because of the fact that Kiss puts on a great show with much leaping about,” he told Mars Music in 1998. “Obviously, guitars will not stay in tune and accuracy goes right out the the window. So you fix what’s not

Not that they didn’t try. Kiss actually recorded a series of concerts in the summer of 1975, trying to find the right mixture of energy and precision. “We went back and listened to it, and no one liked anything,” Aucoin told VH1. “The truth of the matter is, after we did those four or five shows that we recorded live, we still didn’t have it.”

Kramer concluded that the initial Alive! album “had the most amount of ‘fixing’ done to it” of any of the band’s live albums – to the point where only Criss’ drum tracks were presented without additional overdubs.