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I know that F4 have single cycle Multiply–accumulate operation, which is very important for DSP, and F3 doesn't have this feature, but on the other hand I need to do a simple audio project with digital filters.
See the STM32 DSP library from ST and CMSIS DSP Software Library from Keil:
The library is completely written in C and is fully CMSIS compliant. High performance is achieved through maximum use of Cortex-M4 intrinsics.
The supplied library source code also builds and runs on the Cortex-M3 and Cortex-M0 processor, with the DSP intrinsics being emulated through software.