Hi everyone; I often have trouble slurring to/tonguing the F at the top of the staff. When I slur up to it, it usually goes higher than I aimed for. When I tongue it repeatedly I hear my tone deteriorating into a crackling sound. Generally I just can't play it consistently clean. I think I'm using proper technique (using the tongue/speeding up or slowing down air/taking deep breaths) but it is still not consistent. I was wondering if anyone had any exercises to recommend me that will help me play that note more cleanly. Thanks.