Searching a bit in the Net on Asian Paleolithic, specially Southern and SE Asian because of their importance regarding the early human expansion in Eurasia, found this e-book: Prehistory of the Indo-Malaysian Archipielago by P. Bellwood (p. 159-161).
My interest focuses in what existed prior to Hoabinian (c. 17,000-3,000 BP):
1. Sonviian: N. Vietnam, S. Thailand and peninsular Malaysia (c. 23-11,000 BP uncalibrated). Somewhat different from Hoabinian but also a "cobble culture". Both cultures overlap in space and time.
2. Kota Tampan (peninsular Malaysia): c. 31,000 BP (dated by fission racks in zircon) over a Toba explosion ash layer. Resembles Sonviian. Unlike further north, there is a blank between Kota Tampan and full Hoabinian (c. 13,000 BP)
3. Lang Rongrien (southern Thailand): c. 38,000-28,000 BP (uncalibrated), and related site Moh Khiew (c. 26,000 BP), with a bifacial retouch industry. Distinct from the other "cobble cultures". The author suggests it could be similar to another culture in Sabah. Lang Rongrien also has a Hoabinian of later date, with a thick sterile layer in between.
The LGM hiatus seems unique to the Malay peninsula and southern Thailand and does not exist furthern north in SE Asia or China.
I'd thank any reader who could point me to useful links (not books) on Asian Middle and Upper Paleolithic, very specially those that provide synthetic data with dates (and, yeah, I love maps and illustrations too) .