I'm trying to get a good slap tone out of my admittedly pathetic Squier Affinity P-Bass, and I've actually managed to get halfway there with some other amps. It's harder to achieve that same tone with my Hartke though, and I believe this is largely due to the cumbersome Shape control. In case you're not familiar with it, you select a frequency between about 100 and 1000hz, and it puts a -20dB notch at that frequency. This to me seems rather extreme, and I can't turn it off of negate it with the "standard" Treble, Mid, Bass controls. Any advice?