Table: music_production_center
Columns: model
release_date
price
midi_inputs_outputs
sampling_rate
sampling_memory_upgrade_able
sampling_time
storage_method
pad_banks

Question: Which Sampling Memory/Upgrade-able has a rate of 16-bit 44.1khz?
SQL: SELECT "sampling_memory_upgrade_able" FROM music_production_center WHERE "sampling_rate" = '16-bit 44.1khz'

Question: Around what time frame release a Sampling Rate of 12-bit 40khz?
SQL: SELECT SUM("release_date") FROM music_production_center WHERE "sampling_rate" = '12-bit 40khz'

Question: How much is a product with a Sampling Rate of 12-bit 40khz?
SQL: SELECT "price" FROM music_production_center WHERE "sampling_rate" = '12-bit 40khz'