On "Flori Ilegale" (Illegal Flowers), he takes an inquisitive stance in approaching the newly developed drug habits of the younger Romanian population while speaking about his own problems with marijuana abuse.

Guess Who also references his issues with marijuana on the album's lead single, "Tu" (You), where, over an Agresiv reggae-funk infused beat he shares the songwriting with longtime collaborator Spike.

The song depicts the duo's bizarre adventures while smoking marijuana as they go through various mental states, from anxiety and relaxation to being close to having a panic attack as they get pulled over by the police and, although the track seems to actually stand as an anti-drug ode, as they describe their weird and unpleasant sensations they experience while being intoxicated, it appears to have caught on with the Romanian audience for the sole reason it references drug abuse.

[2] After "A Doua Oara" (The Second Time), a laid-back collaboration with Grasu XXL that depicts the various promises an individual makes to himself after undergoing various unpleasant experiences, Guess Who unfolds a soulful story about a young married couple who desperately try to survive and provide for their children in the Romanian society through the perspective of the male counterpart of the relationship over a jazz-influenced, Agresiv-produced instrumental.

A dark piano riff on "Eu, Tu Si Restu' ..." (Me, You And The Rest ...) plays as Guess Who examines a complicated relationship with a woman with whom he has grown apart to the point that he finds her presence highly irritating while JJ provides the background vocals.

The track also contains a sample of the highly acclaimed Cristian Nemescu film Marilena from P7, featuring one of the characters expressing his beliefs that all women are materialists who only use men to achieve personal goals.

Under the appearance of a jazzy love song he cynically renders romance useless when dealing with women only interested in material values as he applies reverse psychology and tells such a woman everything she wants to hear for the sole purpose of having sex with her.

The album's ninth track, "De Urgenta" (Emergency), runs a little over two minutes and, though only an elaborate skit, it appears to be the female counteroffensive to the misogynistic tone of "Eu, Tu Si Restu' ..." (Me, You And The Rest ...) and "Special".

It features Guess Who singing a few words over a multi-layered guitar track and a sample of Romanian actress Iulia Marcov in character viciously cursing at men in the 2006 short film "Amatorul" (The Amateur).

[3] After Guess Who left Paraziţii's 20 CM Records and started working on new material, he leaked "Flori Ilegale" (Illegal Flowers) and "Eu, Tu Si Restu' ..." (Me, You And The Rest ...) on the Internet and, after receiving positive reviews, he announced the album for a 2007 release.

[5] The CDs were originally mailed to customers through the Romanian Post but after experiencing various problems, the delivery method was changed to a private shipping company to enable fans to receive merchandise faster.

[6] The song was discovered by Romanian radio host Şerban Huidu and he gave high praise to the track's original and intelligent lyrical delivery as he started promoting it on Kiss FM.

"Locul Potrivit" was the single meant to promote the re-release of "Probe Audio" being officially released on December 8, 2009 with a music video directed by Marian Crişan depicting Guess Who's friends and collaborators with protest signs such as "Nu ne-am nascut in locul potrivit" (We weren't born in the right place) or "Ne vedem in anul 3000" (See you in the year 3000), Romanian gymnast Laura Cristache performing some routines as a reference to Romania's underfunded sports system and children dressed as young communists singing the socialist adulation-styled sample of Horia Moculescu's 1977 song "Noi În Anul 2000" (Us In The Year 2000) in the beginning of the song.

Guess Who shares his thoughts on various subjects, generally related to contemporary life in Romania such as Traian Băsescu being elected president, alcohol and drug abuse in high school, the concern that his financial income is very limited as a Romanian hip hop artist and describes the next day, March 8th, as an opportunity for materialist women to show their flaws.

Most critics have noted the contrast between the album's dark and sober production and Guess Who's witty and humorous addressing of his themes while managing to remain serious-minded enough to avoid a completely comical approach.

[8] Mihdel of DivercityCafe also reviewed this album saying, "Probe Audio has been produced by Agresiv and Guess Who, it includes 14 tracks having a strong message to send in its raw lyrics with their ironic approach that emphasize on a more melodic interpretation.