"the group found themselves accused of lip-syncing by Gregory McPherson, also a music teacher at Berklee College of Music, who was listed as an associate producer and string arranger on the group's third album, Step by Step. McPherson alleged that Maurice Starr sang the vocals while the group lip-synced to pre-recorded vocals during their live performances. McPherson also filed a breach of contract and creative infringement lawsuit against Starr.
The group immediately responded to the allegations and interrupted the Australian leg of their tour to fly to Los Angeles to perform live on The Arsenio Hall Show.[20] After performing a medley of their previous hits and their new single, the group (along with Starr) was interviewed by Hall. The group admitted to singing with a backing track during live performances and also admitted that Starr sang harmony on some background vocals"