Vaskimies--
Since U're no stranger to tone sandhi, Banlam (Minnan)-type sandhi will be a snap. The basic rule is:
a) The last syllable in a "sandhi group", or "phrase" -- I think the pros might have a better word for this -- takes its citation tone.
b) All other syllables in the group take their "running", or "sandhi'd", tone.
The biggest challenge as a learner is to get a sense for when a sandhi group ends. As a rule, the last syllable of a noun will end its sandhi group -- when it's not being used as an adjective.
Banlam tone sandhi is "sandhi lite" compared to what exists in Eastern Min. Shanghainese tone sandhi works differently, and seems pretty complicated.
The short answer is that U may need different recordings for each dialect. It depends which ones U're interested in.I'm curious though, do the tones really vary that much from dialect to dialect, for example Penang to Amoy, that no recording would work for every dialect (or at least most of them)? I know that words are going to take on different tones in different dialects and I'm guessing they also sandhi differently depending on dialect as well, but I'm talking about the tones themselves. Is á really pronounced that different in Xiamen than it is in for example Taiwan that I would need separate recordings for both dialects?
Amoy and "Mainstream Taiwanese" (and some Ciangciu dialects, inc. what I've heard of Cebu Hokkien) happen to be "tonally similar". The Amoy dialect is actually mirrored on Taiwan by "the Amoy dialect of Taiwan" -- the dialect of the river-port districts of Taipak (Taibei). Most music was recorded in this dialect up till pretty recently. Twenty years ago, young Taiwanese people generally spoke Mainstream Taiwanese, but sang in Amoy Taiwanese (shades of South Vietnam). These "twin" dialects are a product of a certain era of sea-borne trade and migration which coincided with the rise of Amoy as a big-time port, and the commercialization of northern Formosa. I think lots of older people speak this dialect in Singapore too -- somebody correct me if I'm mistaken. So, it's the most "urban" of all Hoklo dialects. Very few people under 30 are speaking it nowadays, though.
Contour-wise, Coanciu-type dialects, some Ciangciu-type dialects and Penang (generally considered a Ciangciu-type dialect) will differ wildly from Amoy/Taiwan. Just search on this forum for posts on the tones of Bagansiapiapi Hokkien (Sumatra)!! By far the biggest differences between dialects lie in vocab, though. And there's not really a "standard dialect" at this point.