As far as I know, there is no aural alert to accompany the amber memo. As regards the BPTI check at landing gear extension, yes that is part of our company SOP. We check for residual pressure on the BPTI and on the ECAM WHEEL page.
Having said all that, there is a procedure in the FCOM 3 which deals with the very situation you suggest. FCOM 3.02.32 p12 refers. A brief precis of it follows - As you know, the park brake uses alternate (Yellow) pressure (Blue on A330). If residual pressure is indicated on BPTI (Alternate) or ECAM (Normal), it suggests pressing the brake pedals several times to zero the pressure on the alternate system. If that doesn't cure it, it calls for you to select A/BRK MED, which will of course give priority to the normal (Green) system, thus cancelling out the alternate pressure. As long as the the normal system is in use (auto or manual braking), the alternate pressure will be cancelled out, thereby cancelling the problem. Any residual pressure on the normal system will be taken care of by the A/SKID. Therefore in theory, landing with the park brake set shouldn't be too much of an issue, as long as the A/BRK (or continuous manual braking) is used. (Assuming you have normal braking available in the first place!!)
Hope this helps!!!
