Teensy audio alternative
It is not clear how long the sound files are and if you want to play 2 sounds overall or if you want to play and mix 2 sounds at the same time.

Some possibilities:


ISD audio player chips from Nuvoton. Definitely the easiest but most limited when it comes to the length of audio.
Any microcontroller with DMA and an external DAC
Any microcontroller with DMA and a DAC made from a resistor ladder
Any microcontroller with DMA and built-in DAC. For example the EFM32GG has an mp3 player project available. There are also raw audio and Speex demos for this MCU.


Depending on the desired audio lengths the microcontrollers can store the data in internal flash if it is big enough, external SPI flash or SD card. SD card implementation will definitely be the most complex, as you also need to handle the filesystem (eg. FatFS), parse the files etc.