Echo makes everything sound grander. That is the problem. A bengali recitation app with effects can turn a decent voice into something cinematic, and it can turn a good poem into mush. The line between the two is thinner than you think.
Reverb is the useful one. A touch of it smooths the harsh edges of a phone microphone and gives the voice a sense of space, like a small hall. For Tagore's lyrical poems, a little reverb is genuinely flattering. Think of it as good lighting for your voice.
Echo, the repeating kind, is the dangerous one. It suits exactly one thing: dramatic pauses in thundering poems like Bidrohi. Everywhere else it smears the words together. If listeners have to work to understand you, the effect has failed, no matter how cool it sounds.
Here is the rule professionals use. Add the effect until you notice it, then dial it back one step. The best processing is the kind the audience never consciously hears. They just feel that the voice sounds rich.
Also, record dry first. Always. Get a clean take with no effects, then add processing after. If you record with heavy echo baked in, you can never remove it. A clean original can become ten different versions. A processed original is stuck forever.
Effects are seasoning, not the meal. The recitation is the meal. Get the poem right first, then reach for the reverb. More practical settings advice lives in the app guides on banglaabritti.com.