A tunable valve assembly attenuates valve-generated vibration at one or more predetermined assembly resonant frequencies. The invention requires the use of a polymer comprising one or more water dispersible groups per molecule and one or more functional groups, and at least one crosslinking agent comprising one or more blocked functional groups reactive with polymer after unblocking. Outcomes and other benchmarks may be selectively compared against historical trends or known medical benchmarks, and in embodiments scenario modeling based on alternative therapies, procedures or other variables may be presented. A voltage output terminal is connected drains of the first transistor and the second transistor. The method includes processing the service request by applying the registered payment services to the service request.