In Jain tradition, there isn’t a standard “bij mantra” like the Hindu or tantric use of “Hreem.” The classic Jain mantras you’ll commonly encounter are the Navkar Mantra (Namokar Mantra) and other prayers to Tirthankaras. The seed syllable “Hreem” is not a canonical Jain bija mantra, so there isn’t a Jain-standard pronunciation for it.

If you’re asking about Jain pronunciation in general:

• Navkar Mantra (the prayer praising the Tirthankaras) is pronounced with careful, gentle articulation of each syllable in a standard North Indian/Sanskrit-style way.
• Jain mantras are typically chanted with a calm, respectful voice, focusing on right intention (bhav) and proper pronunciation.

If you’d like, tell me a specific Jain mantra or phrase you want pronounced, and I’ll provide a clear, Jain-centered transliteration and pronunciation guide.