On March 16, 1990, the CRTC approved Telemedia Communications Ontario Inc.'s application to amend the Promise of Performance for CIGM by changing the music format from Group III (Country and Country-Oriented) to Group IV (40% Pop and Rock-Softer; 60% Pop and Rock-Harder). Two months later, on May 18, 1990, CKSO and CIGM swapped frequencies. CIGM moved to CKSO's 790 slot on the AM dial, and CKSO took on the new call letters CJRQ and CIGM's 92.7 FM frequency. 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.