[2] It adopted the CIGM calls and a country format in 1978, after CBC Radio was granted a license for its own O&O station, CBCS-FM.

[2] The GM in the station's call sign was chosen by 1978 to honour George Miller, one of the founding investors in the company.

After the 1990 swap, the CKSO call sign no longer existed in the Sudbury area until an unrelated Christian music radio station (as CKSO-FM) began test transmissions in late 2002.

In fall 2005, CIGM and sister station CKAT in North Bay underwent a format change, with country music cut back, although not entirely eliminated, in favour of increased news and sports programming.

[14] On August 17, 2009, CIGM began broadcasting on 93.5 MHz, stunting with a 10-minute test broadcast with mostly classic rock music (including a clip of "Radio Ga Ga" by Queen), including clips from television theme shows (such as Seinfeld and The Flintstones), random clips of other songs, some nature sounds, and sound effects, as well as advising listeners to tune in on August 20 at 10:00 a.m. — at which time the station switched stunts to a Chinese pop music format branded as Kung Pao 93.5, which was actually mostly Chinese classical instrumentals, with a few pop songs in rotation.

At midnight on August 24, AM 790 finished its last country song, "There She Goes" by Sudbury native Gil Grand, followed by an announcement:[17] It's been 32 years since CIGM was born.

On September 30, 2009, at about 5:00 p.m., the old 50,000 watt AM 790 transmitter was turned off, ending nearly 75 years of AM broadcasting in Sudbury, being the last AM radio station outlet in the city.

According to the fall 2011 BBM ratings at Milkman Unlimited dated December 1, 2011, CIGM achieved the #1 status in Greater Sudbury among adults 25-54.