Hatul, I understand your requests which are a bit specific and challenging to get exact answers from the manual. Let me draw some facts to help:
1) The only way to turn off the audible warning for the workload is by turning off all the alarms (requires the 313 code). Other specific warnings however, may be turned on and off individually for visual, audible or both via the menu.
2) The adaptive algorithm changes when the workload warning engages, not until. So, you could use the slider bar in the 'breathing sensitivity' menu (page 34 of SOL manual), to adjust 25 step levels of sensitivity. This will reduce the sensitivity of the alarm based on your workload increase and not change the algorithm until the alarm goes off.
Hope this helps.