Voice Changes (or Voice Alterations) have occurred frequently in Inanimate Insanity. Whether it being a change in voice actor, or the voice becoming slightly higher pitched or lower.
Apple[]
While Apple's voice actor has remained the same, her voice has become much deeper and gravelly over time. It starts to become a bit more crackly in 4Seeing The Future, and in The Snowdown, becomes noticeably lower-pitched at times. The transformation of her voice seems to have completed in Aquatic Conflict. Her voice is commented on being quite raspy in Marsh on Mars by Marshmallow.
Balloon[]
Balloon was one character who hasn't gone through a voice change, as his voice stays being the same high pitched one it always was. Throughout Season 1, all of Balloon's lines are recycled from
his previous lines, starting in Sugar Rush. However, once Balloon joined Season 2 in Breaking The Ice, he talks once again, this time with a higher, and clearer voice. Once speaking in Marsh on Mars, Balloon's voice appeared to sound slightly lower, and now with a bit of a voice rasp. It reverts back to its previous pitch in Tri Your Best, but gets noticeably pitched up in A Kick in the Right Direction. As of Let Er' R.I.P., Balloon's voice actor changed to Ben Cross, giving Balloon a slightly altered voice.
Baseball[]
Baseball's voice became deeper once he re-appeared on Idiotic Island in A New Stage In The Game. His voice became even deeper in The Snowdown, as he pleaded the fans
to vote for him. Towards the end of the series, Baseball's voice was given more expression, and got lower in mid season 2.
Bomb[]
Bomb didn't necessarily go through a
voice change, but rather stuttered less in future episodes. He mostly stuttered in the old episode A Lemony Lesson (excluding "Take the baton!" in War De Guacamole). He had a slight voice change temporarily in 4Seeing The Future.
Bow[]
Although appearing late in the game, Bow had a slight voice change since
her debut. Her voice stayed the same throughout until The Tile Divide, after the hiatus, where her voice lowered a few octaves. As of her return in Let 'Er R.I.P. as a ghost, her voice is accompanied by an echo.
Cheesy[]
In the original advertisement, Cheesy
appeared in One-Shot Wonder talking with a somewhat computerized high voice, similar to that of Paintbrush's, but when appearing in Sugar Rush, his voice even more computerized, and higher. As Cheesy joined Season 2, he first displayed his new voice in the "Cheesy Trailer", being much lower and less computerized than his previous version, yet still a high-pitched voice.
Cherries[]
Cherries' voice surprisingly got a little bit lower in Marsh on Mars. However their voice got higher in Everything's A-OJ.
Fan[]
During his debut in One-Shot Wonder, Fan's voice was higher pitched and had a Chinese accent. In
Tired of the II Hiatus? Fan's voice is lower, while still retaining his accent. Starting with season 2, his voice is lower, and his accent is more subtle, and starting with Tri Your Best, his accent fades as episodes pass, and by Let Er' R.I.P., it is completely gone. Starting with Alternate Reality Show, his voice gets cracker and slightly higher.
Knife[]
Though only slightly, Knife's voice became slightly deeper and expressive
in earlier episodes. His voice also had a slight accent (due to Justin also voicing Gun from Object Mayhem back then), mostly noticeable in The Arena of Death. However, from War De Guacamole onward, Knife got a different voice, much deeper and gruffer than the previous episodes.
Lightbulb[]
While Lightbulb never actually went through a voice change since her first line in A Lemony Lesson, her voice, like many others, deepened, but also acquired an expressive accent towards her later appearances.
Marshmallow[]
Marshmallow was originally voiced by someone named "Amanda" in The Arena Of Death. In The Stacker, Marshmallow received a new squeakier and higher-pitched
voice (done by AnimationEpic). The voice lowered itself ever so slightly throughout each episode, and took its final form in The Penultimate Poll. AnimationEpic, however, retired as Marshmallow's voice actor, and is replaced by Dee Cashin for her new voice in Season 2, which is now higher-pitched, clearer, and more feminine. It is even commented in Marsh on Mars that Marshmallow's voice is high enough to shatter glass.
MePad[]
While MePad's voice has practically stayed identical, the switch from Béatrice Déraciné to Justin Chapman made his voice subtly raspier than before.
MePhone4[]
MePhone4 was voiced by Christian Potenza in The Crappy Cliff, voice actor of Chris McLean from the Total Drama Series, giving him a high pitched voice, but was voiced by Mark Katz for the rest of the series, giving him a deeper voice. Mark's original MePhone4 voice in A Lemony Lesson was much deeper and gruffer voice, which was very gravelly. From The Arena of Death onwards, his voice is quite higher in pitch and less gravelly, becoming higher in pitch every episode.
In Mine Your Own Business' flashbacks, MePhone4's voice, while still recognizable, is slightly happier in order to symbolize his innocence.
MePhone4S[]
Though only being a slight alteration, MePhone4S's voice was originally deep and mysterious in Sugar Rush. Once he returned in 4Seeing The Future, his voice did start
off deep, but as he revealed his identity and intentions and progressed throughout the episode, his voice became angrier and meaner. Once returning in The Tile Divide, MePhone4S received a very Russian accent, based off of Arnold Schwarzenegger.
Microphone[]
Although recent, Microphone's voice became deeper, more expressive, and more tomboyish as the
series progressed. It is also noted that when her volume is turned on, the gain has lowered quite greatly.
Nickel[]
Nickel went through nearly the same concept as Baseball, as
the two both had their voices deepened throughout the show. However, Nickel's voice became much raspier throughout episodes, taking its final form in The Great Escape.
OJ[]
Although not really a change, OJ's voice was raspier in earlier episodes, as well as being very expressionless. As episodes go on, his voice becomes more expressive.
Paintbrush[]
Being only slightly recognizable, Paintbrush went through very minor voice changes as well. Originally, they were voiced
by TotalDramaFantasy, but as stated in an Adamationz video, the voice actor "disappeared" for 3 months, until TheTGrodz began voicing them, starting in The Snowdown. As of this, Paintbrush's voice became slightly deeper as OJ did, and giving a very expressive new motion in Season 2. In Theft and Battery, their voice is slightly deeper and a bit less "scratchy".
In Season 3, Episode 10, Paintbrush's voice became deeper again. It now seems more manly than the earlier Season 2 voice. Paintbrush is now voiced by Jazzy Oliver
Paper[]
Paper's voice started out much calmer and slightly lower than later on. As episodes went on, his voice got much more life.
Pepper[]
Because of numerous voice actors taking her place, Pepper has had the most voice actors of any contestant. She originally
started off with happy higher voice, her actor being Bridgetteandcody2 at the time, but once she appeared in Sugar Rush, she gained a new voice actor, Crasi4tunes, the same voice as Salt, though slightly higher pitched. However, her voice changed once again in The Penultimate Poll, as she then is voiced by Adam's sister, who also voices Salt, though keeping the same higher pitch. In Season 2, she changed voice actors yet again along with Salt, both now being voiced by Adam Katz, but once again, her voice actor switched to Alexa Chapman, who voices both her and Salt, but keeping Pepper higher pitched.
Pickle[]
Besides having the voice deepen slowly over time, Pickle's voice has stayed virtually the same. In
4Seeing The Future, Pickle's voice became slightly deeper, but after the hiatus, Pickle's voice drastically lowered in The Tile Divide; it is notably even deeper in Everything's A-OJ.
Salt[]
Salt's voice has changed slightly less than Pepper. Salt kept her voice actor, Crasi4tunes, up until The Penultimate Poll, whereas both Salt and Pepper were voiced by Adam's sister,
having Salt take a lower octave than Pepper. In Breaking The Ice, she and Pepper were voiced by Adam, but in Everything's A-OJ, her voice switched to Alexa Chapman, giving her a deeper, more mature voice.
Soap[]
Like Microphone, Soap's voice started out high-pitched, but it became deeper and more expressive
as the series went on. When singing, her voice is changed to Vibha Melkote, and her voice is much higher pitched.
Suitcase[]
Suitcase had a high-pitched, more feminine
voice at the start of the season, but from episode 5 onwards, her voice became much deeper and relatively raspier. She got her voice actor's Australian accent from aforementioned episode to episode 13, before taking on a light trans-Atlantic accent in Hatching the Plan.
Taco[]
Due to the voice actor of Taco switching on and off between Adam and his sister, Taco has had voice changes all over, though only some are slightly noticeable. Adam first started voicing Taco in One-Shot Wonder, having his sister be the main actor before this. As the two switch between
voicing her, sometimes both in an episode, the voice continued to get deeper, but will go very high pitched at many times. As of The Tile Divide, Adam became the final voice actor for Taco. However, when it was decided that Taco would make a surprise return in season 2 of II a new voice actor, Aceland Alexander Kent, was brought onto the team. The role eventually went to Rheagan Rizio, a Broadway actress who went to the same high school Adam goes to, giving Taco's voice more of a deeper British tone.
Test Tube[]
Test Tube's voice was originally nasal-toned and high pitched. As a result of Adam's voice still getting deeper, her voice got gruffer starting with A Kick in the Right Direction, as well as gaining an unexplained accent.
Tissues[]
Surprisingly, Tissues' voice had gotten lower in Hatching the Plan.
Toilet[]
Toilet's cameo in Breaking The Ice showcased Toilet's British Cockney voice. However, as the series
progressed, Toilet began to shout more of his lines with intense emotion, further expressing his annoyance.
Tyler Bungard[]
When appearing in Double Digit Desert, Tyler had a higher-pitched voice with a very strange accent, voiced by Justin Miller. Once returning in Journey Through Memory Lane (Part 2), his voice was switched over to Brian Koch, who had a normal-ish voice, now with an American accent, yet still retaining similarly random changes in pitch and volume.