The evidence against the reconstructed pronouncation

These accounts need to be included in the main article.

Chrys C. Caragounis (1995): "The error of Erasmus and un-greek pronunciations of Greek". Filologia Neotestamentaria 8 (16)
Chrys C. Caragounis (2004): Development of Greek and the New Testament, Mohr Siebeck
Th. Papadimitrakopoulos (1889): Βάσανος τῶν περὶ τῆς ἑλληνικῆς προφορᾶς Ἐρασμικῶν ἀποδείξεων. Athens. 
Dionysios Thrax description of the sounds of the mediae (100 BC) which implies that they cannot have been anything but fricatives.
Semitic Linguisitic theory which implies that all proto-Sinaitic based alphabets including Phoenicians, Hebrew and Greek contained letters which were allophones for proto-Semitic fricatives and plosives.
Semitic Linguisitic theory which states that the original Hebrew non-fricative mediae and dasea became fricatives before 280 BC and that the original Hebrew fricative mediae and dasea became breaths by 280 BC, thus proto-Semitic fricative "g" stopped being represented in the written language by 280 BC but was still recognisable as modern Greek gamma in the spoken language and represented as fricative gamma in the Septuagint translation of the Hebrew bible made in 280 BC and later became a breath in the spoken langauge.