If a run fails, do I lose Energy?+
It depends on where it runs. On our server: Energy is only held at the price shown before the run, and comes back on its own if the server confirms the run failed; a failed run does not use a free run either. On your device (HTDemucs (Your device) in Music separation and Audio converter): Energy is taken when the run starts and is not refunded if the run fails, because our server cannot see a run on your device.
How do I top up Energy?+
Sign in, open the Top up Energy page, pick a package (the smallest is 5E, that is 5,000 VND) and pay by bank transfer: scan the QR code, or open your bank app with the amount and note already filled in. The Energy reaches your account once the bank reports the payment.
Do I have to sign up for a monthly plan?+
No. There is no monthly plan or subscription: you top up Energy when you need it, and Energy is only spent when a run has to be paid for.
Does the free version add a watermark or lower the quality?+
No. No sound or logo is added to your result, and the same processing method gives the same quality whether you use it free or paid. The difference is the file name: a free file gets “ - TachNhac.com” at the end of its name, a paid one keeps the original name. Common audio files, spectrogram images and MIDI, paid ones included, may also carry the line “TachNhac.com - https://tachnhac.com” in the file's comment field, not in the sound. If it cannot be added without touching the audio, it is left out.
How is a song's length counted?+
Length is rounded to the nearest second, then up to whole minutes: a song of 3 min 40 s counts as 4 minutes, and a song shorter than a minute still counts as one minute. Fetching from a link is counted in whole 4-minute blocks; a part block counts as a full one.
I used free runs before signing in. How many are left once I sign in?+
Runs you used before signing in still count once you sign in on the same device. For example, with Spleeter in Music separation: not signed in you get 2 runs, signed in 5 runs; use 2 runs and then sign in, and you have 3 runs left, not 5 runs.
Are free runs shared between tools?+
No. Free runs are counted separately for each processing method of each tool: two processing methods of the same tool have their own runs too. A run started from a pasted link uses free runs of both Link downloader and Music separation.
