Further Chips inside the UA-25 (not complete):

IC18, IC19, IC20, IC21, IC42: uPC4570 Dual OpAmp
IC22, IC24, IC28: NJM2100 Dual OpAmp
IC23, IC25, IC29: NJM4556A (Dual High Current OpAmp)

IC2: LV08A
IC3: TUSB3200AC (USB Streaming Controller)
IC5: AKM AK4385 (2 channel DAC)
IC7: I2C EEPROM, Label: "464I 45G2 4T", probably 24C64
IC13: AKM AK4114 (Digital Audio Interface Transceiver)
IC15: PC410L (Optocoupler for MIDI input)
IC16: ??? Label: VHC 165 448
IC17: ??? Label: 2008 561
IC30: ??? Label: 56TI AIO

IC31: TPS60111 (DC/DC converter for 5 V)
IC33: NJM2374A (DC/DC converter)
IC40: LV08A

IC7 seems to be the EEPROM, most probably a 24c64 with pins 1-4 tied to ground, like in application example of TUSB3200 datasheet. The I2C lines are also connected to the CN2 connector to be able to flash the firmware...