Unfortunately, the English alphabet and sounds available offer some limitations when speaking and writing critterspeak. For example, in English the letter a is used to refer to two sounds, one which the letter u, o and i also partially cover. Critterspeak is phonetic and therefore every letter only ever makes one sound. Which being said, when the equivalent letter of ä is written in critterspeak, it makes the a sound in "ant", and when a is used it's the a sound in "small", which also corresponds with the u sound in "under", the o sound in "on", and the first half of the i sound in "item" (as it also makes a y sound after).

The apostrophe "  '  " is also used to represent a sound, this time the "schwa" sound which is found commonly in English yet is represented with practically every vowel, making it hard for speakers to even notice they are pronouncing it. It is the second o sound made in "bottom" or the first a in "away". Phonetically it is referred to as the mid central unrounded vowel. 

As for the kh and jh sounds, kh is the voiceless velar fricative [x] but may also be pronounced as [χ] since they are seen as allophones, or the same sound. Jh is the voiced post-aveolar fricative [ʒ], a sound made by the s sound in "vision".

H    on the other hand is a little bit different, since when typing using the English alphabet, you represent it with "c"; yet its sound is wedged somewhere between a k and h sound, almost a softer k sound if you will. As if you were trying to sound out k; but your mouth was open enough to allow air to  pass through akin to the h sound. Here is was represented with "h     "​ ‎stuck together to explain the sound, but will from here on be represented with c. Phonetically it is the voiceless pharyngeal fricative [ħ].