After listening to Getz/Gilberto SACD featuring Antonio Carlos Jobim and Norman Granz's Jam Sessions CD (The ballads mostly) for several months I keep hearing a sound I cannot identify. It occurs, usually at the end of the various tenor sax chords and sounds "like" sand paper rubbing on a board or brick. It also sounds bit like someone walking on gravel. At first I thought it was my audio equipment(ampliflier clipping or limitations in my spearkers) but I have upgraded these components and still hear the same unknown sound.
Has anyone listened to this music that can tell me what I am hearing?