It seems that Hydrogen software supports both import and export of standard WAV audio and thus you can use to export, .h2song drum notations to audio format using the default export function.
Convert Hydrogen drum notes to WAVe PCM Sound, standard Windows sound format.
We have found one software suitable in our database for this conversion.
Linux/Unix software - convert h2song to wav on Linux
Hydrogen is a software synthesizer which can be used alone, emulating a drum machine based on patterns, or via an external MIDI keyboard/sequencer software.
Convert from h2song file
to wav file
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.