An alternate recording of this concert which includes SPOKEN COMMENTARY from the original ABC FM radio broadcast is available here [320kbps MP3 audio]:-

https://sgourosmp3.com/19890204_Sydney_Dimitris_Sgouros_Tchaikovsky_Piano_Concerto_1_Sydney_SO_Challender_Liszt_Etude_10_encore.mp3

Digitized from a different audio cassette source it may offer superior sound quality!