I wish I had this to hand when starting out learning Chinese, a Pinyin pronunciation soundboard that features all pronunciation combinations and for each tone! This is extremely useful if you’re just starting out or even want to brush up on some areas where your pronunciation might be in need of a tune up.
The soundboard features all of the pronunciation combinations and for each tone, too. Just click the links across the top to switch to a different tone:
Found via reddit/r/ChineseLearning (a great place for talk about learning Chinese and resources like this).
For an offline reference you can also download and print the ChineseHacks Pinyin/Zhuyin Cheatsheet.